JP2012221390A - Traffic signal controller and traffic signal control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a traffic signal controller capable of appropriately determining application propriety of a time difference aspect even when traffic information of inflow paths is abnormal, in the traffic signal controller for dynamically determining the application propriety of the time difference aspect for the inflow paths facing each other at an intersection.SOLUTION: A traffic signal controller 1 has a control part 101 for executing movement control capable of selecting, as an aspect of an intersection IS, one of a first time difference aspect 1 φ-1 to give a passage to an inflow path L1 of the intersection IS, a second time difference aspect 1 φ-2 to give a passage to an inflow path L5, and a bidirectional aspect 1 φ-3 to give a passage to both of the inflow paths L1 and L5. The control part 101 selects one of the plurality of aspects according to a result of determining whether or not traffic information in the inflow paths L1 and L5 is abnormal when executing the movement control.

Description

  The present invention relates to a traffic signal control device that dynamically determines whether or not a time difference display is applicable to an inflow path facing at an intersection, and a traffic signal control method performed by the device.

In the technical field of traffic signal control, “present” (also referred to as “phase”) is a right of traffic given to a set of traffic flows, and is a combination of one blue display. The “presentation method” is a combination of presenting methods, and it is necessary to select the most efficient method according to the actual traffic conditions.
In the standard two-way display control at a general crossroad intersection, it is also referred to as a first “bidirectional display” (“face-to-face display”) that gives a right of passage to an upstream / downstream inflow path in a specific direction (for example, east-west direction). ) And a second “bidirectional display” that gives the right of access to the upstream and downstream inflow paths in the crossing direction (for example, the north-south direction).

In addition, as a multiple display method using three or more displays, there is a case where a “right turn exclusive display” or a “time difference signal display” is interposed in the two displays.
Among these, “right turn exclusive indication” (hereinafter simply “right turn indication”) gives right to only right turn vehicles by means of blue arrow indications in the right turn direction, etc. in order to handle right turn vehicles safely and smoothly. It is a presentation to give. In the case of entering a right turn display in both directions intersecting at a crossroad intersection, a total of four displays including two bidirectional displays and two right turn displays are required.

On the other hand, “time difference type signal display” (hereinafter simply referred to as “time difference display”) refers to a pair of inflows facing each other in order to promote traffic on an inflow route that is congested due to the lack of right-turn traffic. In the road, the green signal display on the traffic jam side with a lot of right turn traffic is extended, and the green signal display on the opposite side is interrupted during this period.
Such a time difference display is usually set in a fixed manner for an inflow path in a specific direction with a large amount of right turn traffic throughout the day.

However, depending on the intersection, the amount of right turn traffic on one or more inflow paths may change in the morning and evening hours, or may change every cycle. Here, one cycle means that the signal light color is displayed once.
Therefore, “status change control” and “movement control” (“moving control”), which is a traffic signal control method that dynamically determines whether or not the time difference indication is applicable according to the traffic situation of one or a plurality of inflow paths toward one intersection. Implementation of “variable phase control” is also under consideration.
The status change control is a control method that can determine whether or not to apply the time difference indication at the start of the cycle, and the movement control is a control method that can determine whether or not to apply the time difference indication during the cycle (Patent Document 1). reference).

JP 2006-268547 A

In the conventional status change control and movement control described above, traffic information (for example, a pulse signal indicating vehicle detection on / off every 100 sec, traffic volume per minute) from a vehicle detector installed in the inflow path. If the traffic information is abnormal due to a malfunction of the vehicle sensor, etc., the traffic time will be determined based on this traffic information. The time difference indication may not be properly adopted.
For example, even if you want to adopt the time difference indication that gives the right of passage to a specific inflow path because the specific inflow path of interest (hereinafter sometimes referred to as “specific inflow path”) is congested. If the traffic information of the inflow path is, for example, that vehicle detection is always off every 100 msec, or if the congestion length per minute is 0 m, it is erroneously determined that the specific inflow path is vacant. In some cases, a time difference display that gives the right of passage to the inflow path opposite to the specific inflow path may be used to spur the congestion of the specific inflow path.
In addition, since the specific inflow path is vacant, even if it is desired to adopt the time difference indication that gives the right of passage to the inflow path opposite to the specific inflow path, the traffic information of the specific inflow path is, for example, a vehicle every 100 msec. If the perception is always on, or if the congestion length per minute is over 500 m for a long time, the specific inflow path is erroneously determined to be congested, and conversely, the right of passage is given to the specific inflow path Adopting the time difference display may cause useless blue time in a specific inflow path.

  The present invention has been made in view of such circumstances, and in a traffic signal control device that dynamically determines whether a time difference indication is applicable to an inflow path facing at an intersection, traffic information of the inflow path is abnormal. Even if it exists, it aims at providing the traffic signal control apparatus which can determine appropriately the applicability of a time difference display.

  A traffic signal control device according to a first aspect of the present invention is a traffic signal control device that dynamically determines whether or not a time difference indication is applicable to an inflow path facing at an intersection, and acquires traffic information of the facing inflow path. Control for executing a selection process capable of selecting any one of a plurality of indications including a time difference indication as the indication of the intersection based on the traffic information acquired by the traffic information acquisition unit and the traffic information acquisition unit And an abnormality determination unit that determines whether or not the traffic information acquired by the traffic information acquisition unit is abnormal, and the control unit further performs the selection process according to a determination result of the abnormality determination unit. (Claim 1).

According to the first aspect of the present invention, the selection process is performed in which one of a plurality of indications including a time difference indication can be selected in accordance with the determination result of whether or not the traffic information of the opposite inflow path is abnormal. Therefore, even if the traffic information of the inflow channel is abnormal, it is possible to appropriately determine whether or not the time difference display is applicable.
The traffic information here includes traffic information (for example, traffic per minute, traffic per minute) calculated from sensor information of the vehicle detector (for example, vehicle sensing on / off every 100 msec). Sensor information itself as well as traffic jam length).

When the control unit determines that the abnormality determination unit is abnormal, it is preferable to select one other than the time difference display among the plurality of selectable displays (Claim 2). It is preferable to select a bidirectional display that gives a right of passage to both of the opposing inflow paths.
If it is determined that the traffic information of the inflow channel is abnormal, if the time difference display is selected, there is a risk that the traffic congestion will worsen further in the congested inflow route, or that wasteful blue time may occur in the vacant inflow route. is there.
Therefore, when it is determined that the traffic information of the inflow channel is abnormal, it is preferable to select something other than the time difference display, especially the bi-directional display that has little influence on the traffic situation of both inflow channels. Then, it is possible to reduce the possibility that the traffic congestion will be further deteriorated in the inflow route where the traffic is congested and the possibility that wasteful green time will be generated in the free inflow route.

  Further, the traffic information acquired by the traffic information acquisition means includes traffic information of each right turn direction at the intersection of the inflow path, and the control means includes the traffic information of the inflow path acquired by the traffic information acquisition means. In the case where the selection process is executed based on traffic information in each right turn direction at the intersection (Claim 4), the determination result as to whether or not the traffic information in each right turn direction is abnormal. Accordingly, it is preferable to execute a selection process capable of selecting any one of a plurality of indications including a time difference indication.

For example, the right turn traffic volume (the number of right turn vehicles) of a specific inflow path (a specific inflow path of interest) in a certain cycle is the right turn traffic volume (number of right turn vehicles) of the inflow path facing the specific inflow path in the same cycle. In many cases, if the control is performed to select the time difference display that gives the right of passage to the specific inflow path in the cycle, the right turn traffic volume is relatively easy to change from cycle to cycle. It is important to accurately grasp the traffic volume. This is because if the right turn traffic volume cannot be accurately grasped, the right turn vehicle cannot be properly driven, and this may cause traffic congestion upstream of the inflow path.
Therefore, if it is determined that the traffic information in each right turn direction of the opposite inflow path is abnormal, the time difference display is not selected, but the bidirectional display that has little influence on the traffic situation of both inflow paths is selected. Is preferred.

When the control means is configured to execute the selection process in the middle of a cycle (Claim 5), that is, when movement control is to be executed, in particular, in the opposite inflow path, It is preferable to execute a selection process capable of selecting any one of a plurality of indications including a time difference indication according to a determination result of whether or not the traffic information is abnormal.
Intersections where movement control is executed are often intersections where the amount of right-turn traffic tends to fluctuate from cycle to cycle, so it is important to accurately grasp traffic information for each cycle of the opposite inflow path in real time. Become. This is because, if the traffic information for each cycle cannot be accurately grasped in real time, the right turn vehicle in the cycle cannot be properly driven or there is a risk of causing traffic congestion on the inflow path.
Therefore, when it is determined that the traffic information of the opposite inflow paths is abnormal, it is preferable not to select the time difference display but to select the bidirectional display that has little influence on the traffic conditions of both inflow paths.

  In the movement control, any one of a plurality of indications including a time difference indication “select the indication” means, for example, the step of the ring 1 in the case of the dual ring method disclosed in Patent Document 1. As a result of changing the switching timing and the switching timing of the steps of the ring 2, it means to include the case where any one of “presentation appears”.

The traffic signal control method according to the second aspect of the present invention is a traffic signal control method for dynamically determining whether to apply a time difference indication to an inflow path facing at an intersection, wherein traffic information of the facing inflow path is obtained. Based on the traffic information acquisition step to be acquired and the traffic information acquired in the traffic information acquisition step, a selection process capable of selecting any of a plurality of indications including a time difference indication as the indication of the intersection is executed. A control step, and an abnormality determination step for determining whether or not the traffic information acquired in the traffic information acquisition step is abnormal, the control step further according to a determination result of the abnormality determination step, The selection process is executed (claim 6).
The second invention is an invention related to a method having the same contents as the first invention, and is useful in the same manner as the first invention.

  ADVANTAGE OF THE INVENTION According to this invention, even if the traffic information of the inflow path which opposes at an intersection is abnormal, the applicability of a time difference display can be determined appropriately.

1 is a road plan view of a traffic signal control system including a traffic signal controller (traffic signal control device) according to Embodiment 1. FIG. It is a transition diagram of the present 1 cycle in movement control. 3 is a flowchart illustrating a procedure of movement control according to the first embodiment. It is a road top view of the traffic signal control system containing the traffic signal controller (traffic signal control device) concerning Embodiment 2. 10 is a flowchart illustrating a procedure of movement control according to the second embodiment. 10 is a flowchart illustrating a procedure of movement control according to the second embodiment.

Embodiment 1:
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[Overall system configuration]
FIG. 1 is a road plan view showing a traffic signal control system including a traffic signal controller (traffic signal control device) according to the first embodiment. As shown in FIG. 1, the traffic signal control system according to the present embodiment includes a traffic signal controller 1, a signal lamp 2, a vehicle detector 3, a central device 4 and the like to which the traffic signal controller of the present invention is applied. It is out.
The number of lanes of the inflow paths L1, L3, L5, L7 and the outflow paths L2, L4, L6, L8 of the crossroad intersection (hereinafter simply referred to as “intersection”) IS shown in FIG. The structure of the intersection IS is not limited to that shown in FIG.

The traffic signal controller 1 is connected to four signal lamps 2 installed near the upstream ends (ends on the intersection IS side) of the outflow paths L2, L4, L6, and L8 at the intersection IS through power lines. Yes. In the example of FIG. 1, the signal lamp 2 includes blue, yellow, and red round lamps as vehicle lamps, and blue arrow lamps of left turn arrows, straight arrows, and right turn arrows.
The traffic signal controller 1 is connected to a central device 4 in a traffic control center via a communication line such as a telephone line. The central device 4 is a traffic signal controller 1 at a plurality of intersections IS in its own jurisdiction area. And a local area network (LAN).

Accordingly, the central device 4 can perform bidirectional communication with the traffic signal controller 1, and the traffic signal controller 1 can also perform bidirectional communication with the controller 1 at other intersections. The central device 4 may be installed on the road instead of the traffic control center.
The traffic signal controller 1 receives a signal control command, which is an output of the result of traffic sensitivity control by the central device 4, from the central device 4, and turns on / off each signal lamp included in the signal lamp device 2 based on the signal control command. And control blinking.

The traffic signal controller 1 is also connected to the vehicle detector 3 via a communication line. The vehicle sensor 3 generates sensor information necessary for traffic sensitivity control performed by the central device 4 and terminal sensitivity control (including movement control) performed by the traffic signal controller 1 at the intersection IS. The sensor information is transmitted to the traffic signal controller 1, relayed by the traffic signal controller 1, and transmitted to the central device 4 via the communication line.
There are various types of the vehicle sensor 3 depending on the type of the sensitive control, but the traffic information necessary for the movement control by the traffic signal controller 1 of the present embodiment and the vehicle sensor 3 for obtaining the traffic information. Specific examples are listed as follows.

1) Traffic volume V1, V3, V5, V7 of inflow channels L1, L3, L5, L7 (number of vehicles 5 passing per unit time)
This traffic volume is, for example, an ultrasonic vehicle detector or loop installed for each lane at a predetermined distance (for example, 150 m) upstream from the intersection IS in the inflow paths L1, L3, L5, and L7. Measurement can be performed based on sensor information such as a coiled vehicle sensor (for example, a pulse signal indicating vehicle on / off every 100 msec).

2) Congestion length of the inflow paths L1, L3, L5, L7 This congestion length is, for example, a predetermined distance upstream from the intersection IS in the inflow paths L1, L3, L5, L7 (for example, 150 m, 300 m, 500 m,... ) It can be measured based on sensor information such as a plurality of ultrasonic vehicle detectors and loop coil vehicle detectors installed in separate lanes for each lane.
A method for estimating the congestion length from the pulse signals of a plurality of ultrasonic vehicle detectors is well known and will not be described in detail. For example, the method described in claim 1 of JP-A-8-161686, There is a method described in the prior art section of the publication as a congestion length that is a section length where the spillover at the sensor installation position is a predetermined value or more.

  A real-time image of the vehicle 5 being taken by using one or a plurality of image-type vehicle detectors capable of recognizing images in all sections or predetermined sections of the inflow channels L1, L3, L5, and L7. Based on the data, the traffic volume and congestion length of the inflow channels L1, L3, L5, and L7 may be measured.

The central device 4 controls the traffic signal controller 1 belonging to its own jurisdiction area with system control for adjusting a group of traffic signal controllers 1 on the same road, or wide area control (surface Control).
That is, the central device 4 calculates necessary traffic information for each predetermined period based on the sensor information acquired from the vehicle sensor 3 every predetermined period (for example, one minute or one cycle), and the calculated traffic information. Based on the above, it is possible to perform traffic sensitive control for setting signal control parameters (cycle length, split, offset, etc.) for each traffic signal controller 1.

Here, the definitions of the terms cycle length, split and offset are as follows.
• Cycle length: The time required for one cycle is called the cycle length.
• Split: The time ratio of each display in one cycle is called a split.
• Offset: In system control, the deviation that is given to the start of one cycle of each traffic signal controller is called offset.

The traffic sensitive control includes, for example, a plurality of types including MODERATO control, profile control, and the like. The central device 4 outputs a signal lamp 2 every predetermined time, which is an output of the result of the traffic sensitive control. Is transmitted to the traffic signal controller 1 every predetermined cycle period (for example, 1 to 2.5 minutes).
Further, the central device 4 transmits control type information including permission / inhibition of terminal sensitive control at the intersection IS and traffic information at the intersection IS to the traffic signal controller 1 at the intersection IS.

In addition, the central device 4 detects an abnormality in each traffic information of each inflow path of each calculated intersection IS, and when an abnormality is detected, information to that effect to the traffic signal controller 1 using the traffic information. Send.
Specifically, when the central device 4 calculates the traffic volume and the congestion length of each inflow path of each intersection IS for each predetermined period, it is determined whether or not each is abnormal as follows.
For example, statistics of traffic volume and congestion length in a predetermined cycle are calculated in advance every predetermined time zone (for example, 1 hour), and the traffic volume and congestion length calculated in each predetermined cycle are included in the predetermined cycle. It can be determined that there is an abnormality when the value is significantly higher than or significantly lower than the statistical value of the time zone.
In addition, for example, the traffic volume and the congestion length calculated for each predetermined cycle are continuously a predetermined first number of times (for example, 120 times) or more and a predetermined first threshold (for example, 0 traffic / predetermined cycle, traffic jam). Or a predetermined second number of times (for example, 1200 times) or more, a predetermined second threshold value (for example, 60 vehicles / predetermined period, a congestion length of 500 m / When it exceeds the predetermined period, it can be determined that there is an abnormality.
As a result, for example, when an abnormality is detected with respect to the traffic volume and the congestion length of the inflow path L1 of a certain intersection IS, the traffic volume and the congestion length of the inflow path L1 to the traffic signal controller 1 of this intersection IS. Information indicating that an abnormality has been detected (hereinafter referred to as “abnormal information”) is transmitted.
In addition, the abnormality detection method of traffic information is not restricted to said example, Various abnormality detection methods are employable.

[Configuration of traffic signal controller]
As shown in FIG. 1, the traffic signal controller 1 includes a control unit 101, a storage unit 102, a communication unit 103, and a lamp driving unit 104 inside.
The control unit 101 includes one or a plurality of microcomputers, and is connected to the storage unit 102, the communication unit 103, and the lamp driving unit 104 via an internal bus. The control unit 101 controls operations of these hardware units.

The control unit 101 normally generates the lamp color switching timing of the signal lamp device 2 in accordance with a signal control command that is an output resulting from the traffic sensitivity control performed by the central device 4. Moreover, the control part 101 produces | generates the lamp color switching timing of the signal lamp device 2 according to the result of the terminal sensitive control performed in an own apparatus, when the control classification information from the central apparatus 4 has permitted terminal sensitive control.
The lamp driving unit 102 includes a semiconductor relay (not shown), and turns on / off the AC voltage (AC 100 V) or DC voltage supplied to each signal lamp of the signal lamp 2 based on the signal switching timing generated by the control unit 101. Turn off.

The communication unit 103 is a communication interface that performs wired communication with the central device 4 and the vehicle detector 3, and includes signal control commands, control type information, and traffic information (for example, inflow) necessary for terminal sensitive control performed by the own device. Road congestion length), abnormality information and the like are received from the central device 4 and sent to the control unit 101 of the own device.
Further, the communication unit 103 receives sensor information from various vehicle sensors 3, and transmits the sensor information to the control unit 101 of the own device and to the central device 4.

The storage unit 102 includes a recording medium such as a hard disk or a semiconductor memory. The storage unit 102 has a storage area for temporarily storing various information (signal control commands, sensor information, etc.) received by the communication unit 103, and a computer for executing terminal sensitive control set in the own device It has a program storage area.
The control unit 101 performs predetermined terminal sensitivity control by reading the computer program from the storage unit 102 and processing the computer program.

The terminal sensitive control performed by the control unit 101 of the traffic signal controller 1 according to the present embodiment is the above-described “movement control”.
The control unit 101 performs movement control (FIG. 3) based on traffic information obtained from the sensor information of various vehicle sensors 3.

  Therefore, in the following, first, the present method of the movement control will be described with reference to FIG. 2, and then the details of the control will be described with reference to FIG.

[Display method of movement control]
FIG. 2 is a transition diagram showing the current cycle in the movement control.
In FIG. 2, the “main direction” is the east-west direction, and the “secondary direction” is the north-south direction. Further, “td1” and “td2” are “determination reference times” in each of the main direction and the subordinate direction. This determination reference time is set, for example, at the end time of the floor PF (pedestrian blue blinking).

With reference to FIG. 2, the contents of the presenting method used in the movement control and the presenting method as a combination thereof are listed as follows.
Current indication 1φ: “bidirectional indication” in the main direction, and the right of passage is given to the inflow channels L1 and L5 by a blue round light.
Current indication 2φ: “right turn indication” in the main direction, and the right-handed right is given to the inflow paths L1 and L5 only by the red round light and the right turn blue arrow light.

Present 1φ-1: Gives right of passage to all directions of left turn, straight ahead, and right turn by the blue arrow light with respect to the inflow passage L1 in the main direction, but does not give the right of passage to the inflow passage L5 opposite to it. Current indication "(hereinafter sometimes referred to as" first time difference indication "in the main direction).
Present 1φ-2: A right arrow gives a right of traffic to the inflow path L5 in the main direction by a blue arrow light, but does not give a right of traffic to the inflow path L1 opposite to it. Current indication "(hereinafter sometimes referred to as" second time difference indication "in the main direction).
Indication 1φ-3: “Bidirectional indication” that continues as it is after the determination reference time td1 in the main direction.

Current indication 3φ: “Bidirectional indication” in the subordinate direction, and the right of passage is given to the inflow channels L3 and L7 by a blue round light.
Indication 4φ: “right turn indication” in the subordinate direction, and the right to pass is given to the inflow paths L3 and L7 only in the right turn direction by the red round light and the right turn blue arrow light.

Present 3φ-1: The right direction is given to the inflow path L7 in the subordinate direction by the blue arrow light in all directions of left turn, straight advance and right turn, but the right of passage is not given to the inflow path L3 facing it. (Hereinafter, sometimes referred to as “first time difference display”).
Present 3φ-2: The right direction is given to the inflow path L3 of the subordinate direction by the blue arrow light in all directions of left turn, straight advance and right turn, but the right of passage is not given to the inflow path L7 opposite to it. Current indication "(hereinafter sometimes referred to as" second time difference indication "in the main direction).
Current indication 3φ-3: “Bidirectional indication” that continues as it is after the determination reference time td2 in the secondary direction.

In the movement control of the present embodiment, at the determination reference time td1 in the main direction, the display after the bidirectional display 1φ is changed to the first in the main direction according to the traffic information in the main direction at that time and the abnormality information. The time difference display 1φ-1, the second time difference display 1φ-2 in the main direction, and the bidirectional display 1φ-3 are selected, and the right turn display 2φ is connected after the selected display.
Similarly, at the determination reference time td2 in the subordinate direction, the indication after the bidirectional indication 3φ is changed to the first time difference indication 3φ− in the subordinate direction according to the traffic information in the subordinate direction at that time and the abnormality information thereof. 1. Select from the second time difference display 3φ-2 and the bidirectional display 3φ-3 in the secondary direction, and connect the right turn display 4φ after the selected display.

For example, as in the dual ring method, the step switching timing of the ring 1 and the switching timing of the step of the ring 2 are respectively changed to change the first time difference indication 1φ-1, the second time difference indication 1φ-2, and Any one of the two-way indications 1φ-3 appears, and as a result, one of the three types of indications 1φ-1,2,3 may be selected.
Therefore, in the movement control of the present embodiment, “selecting the present” is used as a broad meaning including the case where “present is made to appear” as a result as described above.

In the present embodiment, in the main direction, the presenting method of transition from 1φ → 1φ-1 → 2φ is “pattern 1”, and the presenting method of transition from 1φ → 1φ-2 → 2φ is “pattern 2”. The presenting method in which the presenting transitions from 1φ → 1φ-3 → 2φ is referred to as “pattern 3”.
In addition, as shown in FIG. 2, in the secondary direction, the presenting method in which the presenting transitions from 3φ → 3φ-1 → 4φ is changed to “pattern 1”, and the presenting method in which 3φ → 3φ-2 → 4φ is transitioned. “Pattern 2” and the presenting method in which the presenting transitions from 3φ → 3φ−3 → 4φ are referred to as “pattern 3”.

Accordingly, the inflow path L1 in the main direction is referred to as a “specific inflow path”, and the inflow path L5 opposite to the inflow path L1 is referred to as an “opposite inflow path”. It becomes like this.
Pattern 1: An indication method in which the first time difference indication 1φ-1 giving the right of passage to the specific inflow passage L1 is inserted between the bidirectional indication 1φ and the right turn indication 2φ Pattern 2: The right of passage is given to the opposite inflow passage L5 Presenting method in which the second time difference indication 1φ-2 to be given is inserted between the bidirectional indication 1φ and the right turn indication 2φ. Pattern 3: The indication in which the bidirectional indication 1φ-2 is continued and directly connected to the right turn indication 2φ. Indication method

  However, in the example of FIG. 2, the display system changes in the order of bidirectional display 1φ → selectable 3 display 1φ-1,2,3 → right turn 2φ, but right turn display 2φ is advanced. Then, a display method may be adopted in which the display changes in the order of right turn display 2φ → selectable 3 display 1φ-1,2,3 → bidirectional display 1φ.

Accordingly, the contents of the patterns 1 to 3 for the specific inflow path L1 and the counter inflow path L5 in the main direction are generalized in consideration of the case where the right turn indication 2φ is advanced.
Pattern 1: An indication method for causing the first time difference indication 1φ-1 to give the right of passage to the specific inflow path L1 Pattern 2: Current to cause the second time difference indication 1φ-2 to give the right of passage to the opposite inflow path L5 Indication method Pattern 3: An indication method in which neither the first time difference indication 1φ-1 nor the second time difference indication 1φ-2 appears.

[Contents of movement control processing]
FIG. 3 is a flowchart illustrating a procedure of movement control according to the first embodiment.
As shown in FIG. 3, the control unit 101 of the traffic signal controller 1 executes the following movement control process (traffic signal control method by movement control) every cycle.
First, the control unit 101 determines whether or not the determination reference time td1 in the main direction has elapsed (step S1). If it is determined that the time td1 has elapsed (YES in step S1), It is determined whether or not the traffic information in the main direction is abnormal (step S2). That is, it is determined whether or not abnormality information has been received from the central device 4 with respect to the traffic jam length of the inflow channels L1 and L5 most recently received from the central device 4, and at least one of the traffic jam lengths of the inflow channels L1 and L5. If it is determined that the abnormal information is received, the traffic information in the main direction is determined to be abnormal.

When it is determined that the traffic information in the main direction is not abnormal (NO in step S2), the control unit 101 determines whether only the inflow path L1 is congested in the main direction (step S4).
In the determination process of whether or not “only the inflow path L1 is congested” in step S4, the traffic length of the inflow path L1 is not less than a predetermined threshold value Thl (for example, 200 m) in the main direction, and the inflow opposite to the inflow path L1. This can be done depending on whether or not the traffic jam length on the road L5 is less than the threshold value Thl.
The determination process in step S4 calculates a difference (V1-V5) obtained by subtracting the traffic volume V5 of the inflow path L5 from the traffic volume V1 of the inflow path L1, and this difference (V1-V5) is a predetermined threshold Thv. It may be a process of whether or not the above. In this case, in step S2, it is determined whether or not abnormality information is received from the central device 4 for the traffic volume of the inflow channels L1 and L5 most recently received from the central device 4, and the traffic of the inflow channels L1 and L5. If it is determined that the abnormality information is received for at least one of the quantities, it is determined that the traffic information in the main direction is abnormal.

  When it is determined that only the inflow path L1 is congested in the main direction (YES in step S4), the control unit 101 selects “pattern 1” in the main direction as the presenting method of the intersection IS (step S6). ). Thereby, the traffic volume which is congested on the inflow path L1 becomes easy to make.

On the other hand, when it is determined that only the inflow path L1 is not congested in the main direction (NO in step S4), the control unit 101 determines whether only the inflow path L5 is congested in the main direction. Determination is made (step S7).
In the determination process of whether or not “only the inflow path L5 is congested” in the above step S5, the congestion length of the inflow path L5 is not less than a predetermined threshold value Thl (for example, 200 m) in the main direction, and the inflow opposite to it. This can be done depending on whether the traffic jam length on the road L1 is less than the threshold value Thl.
In the determination process of step S7, a difference (V5-V1) obtained by subtracting the traffic volume V1 of the inflow path L1 from the traffic volume V5 of the inflow path L5 is calculated, and the difference (V5-V1) is a predetermined threshold value. Processing of whether or not it is greater than or equal to Thv may be used.

When it is determined that only the inflow path L5 is congested in the main direction (YES in step S7), the control unit 101 selects “pattern 2” in the main direction as the presenting method of the intersection IS (step S9). ). Thereby, the traffic volume which is congested in the inflow path L5 becomes easy to make.
On the other hand, if the control unit 101 determines that only the inflow path L5 is not congested in the main direction (NO in step S7), the time difference display 1φ-1, “Pattern 3” in the main direction that does not adopt 1φ-2 (adopts bidirectional indication 1φ-3) is selected (step S10). Since it can be determined that there is no traffic jam in either the inflow channel L1 or the inflow channel L5 or that there is traffic jam in either the inflow channel L1 or the inflow channel L5, either the inflow channel L1 or L5 This is because it is preferable not to give the right of traffic preferentially but to give the right of traffic equally to both inflow paths.

  If the control unit 101 determines in step S2 that the traffic information in the main direction is abnormal (YES in step S2), the time difference display 1φ-1, 1φ− is used as the display method of the intersection IS. “Pattern 3” in the main direction that does not adopt 2 (adopts bidirectional display 1φ-3) is selected (step S10). “Pattern 1” adopting the time difference indication 1φ-1 or “Pattern 2” adopting the time difference indication 1φ-2 when it is determined that at least one of the traffic information of the inflow paths L1 and L5 is abnormal This is because there is a possibility that the traffic congestion will be further deteriorated in the inflow route where the traffic is congested, or that wasteful green time may be generated in the free inflow route. If you select “Pattern 3”, which uses the bidirectional 1φ-3, which has little influence on the traffic situation of both inflow channels, there is a possibility that the traffic congestion will worsen in the congested inflow route and The possibility that a useless blue time is generated can be reduced, which is preferable.

  Next, the control unit 101 determines whether or not the determination reference reference time td2 in the secondary direction has elapsed (step S11), and when the time td2 has elapsed (YES in step S11), It is determined whether or not the direction traffic information is abnormal (step S12). That is, it is determined whether or not abnormality information has been received from the central device 4 for the traffic length of the inflow channels L7 and L3 received most recently from the central device 4, and at least one of the traffic lengths of the inflow channels L7 and L3. If it is determined that the abnormal information is received, the traffic information in the secondary direction is determined to be abnormal.

When it is determined that the traffic information in the secondary direction is not abnormal (NO in step S12), control unit 101 determines whether or not only inflow path L7 is congested in the secondary direction (step S14).
In the determination process of whether or not “only the inflow path L7 is congested” in the above step S14, in the subordinate direction, the congestion length of the inflow path L7 is equal to or greater than a predetermined threshold value Thl (for example, 200 m), and the inflow opposite thereto This can be done depending on whether or not the traffic jam length on the road L3 is less than the threshold value Thl.
In the determination process in step S14, a difference (V7−V3) obtained by subtracting the traffic volume V3 of the inflow path L3 from the traffic volume V7 of the inflow path L7 is calculated, and this difference (V7−V3) is a predetermined threshold Thv. It may be a process of whether or not the above. In this case, in step S12, it is determined whether or not abnormality information has been received from the central device 4 with respect to the traffic volume of the inflow channels L7 and L3 most recently received from the central device 4, and traffic on the inflow channels L7 and L3 is determined. If it is determined that the abnormality information is received for at least one of the quantities, it is determined that the traffic information in the secondary direction is abnormal.

  When it is determined that only the inflow path L7 is congested in the secondary direction (YES in step S14), the control unit 101 selects “pattern 1” in the secondary direction as the presenting method of the intersection IS (step S16). ). Thereby, the traffic volume which is congested on the inflow path L7 becomes easy to make.

On the other hand, when it is determined that only the inflow path L7 is congested in the subordinate direction (NO in step S14), the control unit 101 determines whether only the inflow path L3 is congested in the subordinate direction. Determination is made (step S17).
In the determination process of whether or not “only the inflow path L3 is congested” in the above step S17, the congested length of the inflow path L3 is not less than a predetermined threshold value Thl (for example, 200 m) in the subordinate direction, and the inflow opposite thereto. This can be done depending on whether the traffic jam length on the road L7 is less than the threshold value Thl.
In the determination process of step S17, a difference (V3-V7) obtained by subtracting the traffic volume V7 of the inflow path L7 from the traffic volume V3 of the inflow path L3 is calculated, and this difference (V3-V7) is a predetermined threshold value. Processing of whether or not it is greater than or equal to Thv may be used.

When it is determined that only the inflow path L3 is congested in the secondary direction (YES in step S17), the control unit 101 selects “pattern 2” in the secondary direction as the method of indicating the intersection IS (step S19). ). Thereby, it becomes easy to make a traffic volume that is congested on the inflow path L3.
On the other hand, when the control unit 101 determines that only the inflow path L3 is not congested in the subordinate direction (NO in step S17), the time difference indication 3φ-1, “Pattern 3” in the secondary direction that does not adopt 3φ-2 (adopts bidirectional indication 3φ-3) is selected (step S20). Since it can be determined that there is no traffic jam in either the inflow channel L7 or the inflow channel L3, or that there is traffic jam in either the inflow channel L7 or the inflow channel L3, either the inflow channel L7 or L3 This is because it is preferable not to give the right of traffic preferentially but to give the right of traffic equally to both inflow paths.

  In addition, when it is determined in step S12 that the traffic information in the subordinate direction is abnormal (YES in step S12), the control unit 101 sets the time difference indications 3φ-1, 3φ− as the indication method of the intersection IS. “Pattern 3” in the secondary direction that does not adopt 2 (adopts bidirectional display 3φ-3) is selected (step S20). “Pattern 1” adopting the time difference indication 3φ-1 or “Pattern 2” adopting the time difference indication 3φ-2 when it is determined that at least one of the traffic information of the inflow paths L7 and L3 is abnormal This is because there is a possibility that the traffic congestion will be further deteriorated in the inflow route where the traffic is congested, or that wasteful green time may be generated in the free inflow route. If you select “Pattern 3”, which uses the interactive 3φ-3, which has little influence on the traffic situation of both inflow channels, there is a possibility that the traffic congestion will worsen in the congested inflow route or The possibility that a useless blue time is generated can be reduced, which is preferable.

  As described above, the traffic signal controller 1 in Embodiment 1 selects either the time difference display or the bidirectional display according to the determination result of whether or not the traffic information of the opposite inflow path is abnormal. Therefore, even if the traffic information of the inflow channel is abnormal, it is possible to appropriately determine whether or not the time difference display is applicable.

Embodiment 2:
In the first embodiment described above, the traffic signal controller 1 causes the first time difference indication to appear based on the congestion length of the inflow paths L1, L5, L7, and L3 and the abnormality information thereof, and the second time difference indication. “Pattern 2” that causes an indication to appear, and which one of “Pattern 3” that causes a bidirectional indication to appear without causing the first and second time difference indications to appear is determined. However, it is configured to determine which one of “Pattern 1”, “Pattern 2”, and “Pattern 3” is selected based on the right turn traffic volume of the inflow paths L1, L5, L7, and L3 and the abnormality information thereof. There may be.

FIG. 4 is a road plan view showing a traffic signal control system including a traffic signal controller (traffic signal control device) according to the second embodiment.
The difference from FIG. 1 is that in each of the inflow paths L1, L5, L7, and L3, an image type vehicle sensor 6 is installed for detecting vehicles in each lane near the intersection including the right turn lane. .
The image-type vehicle sensor 6 is connected to the traffic signal controller 1 through a communication line (this communication line is not shown in FIG. 4), and sensor information for each lane (hereinafter referred to as “intersection detector information”). Is generated. The intersection detector information includes pulse signals (for example, vehicle detection every 100 msec) at a point upstream of a predetermined distance from the stop line of each lane near the intersection including the right turn lane (for example, a point 50 m upstream from the stop line). Pulse signal indicating on / off).
The image-type vehicle sensor 6 transmits the generated near-intersection sensor information to the traffic signal controller 1, and the traffic signal controller 1 further transmits to the central device 4 when the near-intersection sensor information is received.

  The central device 4 makes a right turn in each inflow path of each intersection IS for each predetermined period based on the intersection vicinity sensor information acquired from the image type vehicle sensor 6 for each predetermined period (for example, one minute or one cycle). Calculate lane traffic (right turn traffic). The central device 4 transmits the calculated information of the right turn traffic volume in each inflow path of each intersection IS to each traffic signal controller 1 in the jurisdiction area.

Further, the central device 4 detects an abnormality in each of the calculated right turn traffic information of each inflow path of each intersection IS, and if an abnormality is detected, the central device 4 sends the traffic signal controller 1 using the right turn traffic information. Information to that effect is transmitted.
Specifically, when the central device 4 calculates the right turn traffic volume of each inflow path of each intersection IS for each predetermined period, it is determined whether each is abnormal as follows.
For example, the statistical value of the right turn traffic volume in a predetermined cycle is calculated in advance every predetermined time zone (for example, 1 hour), and the right turn traffic volume calculated in every predetermined cycle is calculated in the time zone included in the predetermined cycle. It can be determined that there is an abnormality when the value is significantly higher than the statistical value or when the value is significantly lower.
In addition, for example, the right turn traffic volume calculated for each predetermined cycle is continuously a predetermined third number of times (for example, 300 times) or more and a predetermined third threshold value (for example, 0 traffic volume / a predetermined cycle) or less. Or when it exceeds a predetermined fourth threshold (for example, traffic volume 40 units / predetermined period) for a predetermined fourth number of times (for example, 1200 times) or more, it can.
As a result, for example, when an abnormality is detected in the right turn traffic volume of the inflow path L1 of an intersection IS, an abnormality is detected in the right turn traffic volume of the inflow path L1 with respect to the traffic signal controller 1 of the intersection IS. Information (hereinafter referred to as “second abnormality information”) is transmitted.
Note that the right-turn traffic volume abnormality detection method is not limited to the above example, and various abnormality detection methods can be employed.

The traffic signal controller 1 executes movement control processing based on traffic information and abnormality information, right-turn traffic information and second abnormality information.
5 and 6 are flowcharts showing the procedure of the movement control according to the second embodiment.
As shown in FIGS. 5 and 6, the control unit 101 of the traffic signal controller 1 executes the following movement control process (traffic signal control method by movement control) every cycle.
Step S21 is the same as step S1 of the above-described first embodiment, and the next step S22 is the same as step S2 of the above-described first embodiment.
Next, when it is determined in step S22 that the traffic information in the main direction is not abnormal (NO in step S22), the control unit 101 determines whether the information on the right-turn traffic volume in the main direction is abnormal. (Step S23). That is, it is determined whether or not the second abnormality information is received from the central device 4 for the right turn traffic volume of the inflow channels L1 and L5 received most recently from the central device 4, and the right turn traffic volume of the inflow channels L1 and L5 is determined. If it is determined that the second abnormality information is received for at least one of the information, it is determined that the information on the right turn traffic volume in the main direction is abnormal.

When it is determined that the information on the right turn traffic volume in the main direction is not abnormal (NO in step S23), the control unit 101 determines whether only the inflow path L1 is congested in the main direction (step S24). . Step S24 is the same as step S4 in the first embodiment.
When the control unit 101 determines that only the inflow path L1 is congested in the main direction (YES in step S24), a value obtained by subtracting the right turn traffic volume of the inflow path L5 from the right turn traffic volume of the inflow path L1 is obtained. It is determined whether or not a predetermined value (for example, five) or more (step S25).

If it is determined that the value is equal to or greater than the predetermined value (YES in step S25), the control unit 101 selects “pattern 1” in the main direction as the method of displaying the intersection IS (step S26).
Thus, when only the inflow path L1 is congested and the right turn traffic volume of the inflow path L1 is larger than the right turn traffic volume of the inflow path L5 by a predetermined value or more, the time difference display 1φ-1 is adopted. By selecting “Pattern 1”, it is possible to efficiently increase the right turn traffic volume of the inflow path L1 without giving a wasteful blue time in the time difference display 1φ-1 and the next right turn display 2φ.

On the other hand, when it is determined that the control unit 101 is not equal to or greater than the predetermined value (NO in step S25), the time difference indications 1φ-1 and 1φ-2 are not adopted as the indication methods for the intersection IS (bidirectional current indication). “Pattern 3” in the main direction (in which the indication 1φ-3 is adopted) is selected (step S30).
This is because if there is not much difference between the right turn traffic volume of the inflow path L1 and the right turn traffic volume of the inflow path L5, it is sufficient to increase the right turn traffic volume of both inflow paths at the right turn indication 2φ.

If it is determined in step S24 that only the inflow path L1 is congested in the main direction (NO in step S24), the control unit 101 determines whether only the inflow path L5 is congested in the main direction. Is determined (step S27). Step S27 is the same as step S7 in the first embodiment.
When the control unit 101 determines that only the inflow path L5 is congested in the main direction (YES in step S27), a value obtained by subtracting the right turn traffic volume of the inflow path L1 from the right turn traffic volume of the inflow path L5 is obtained. It is determined whether or not it is a predetermined value (for example, five) or more (step S28).

If it is determined that the value is equal to or greater than the predetermined value (YES in step S28), the control unit 101 selects “pattern 2” in the main direction as the method of displaying the intersection IS (step S29).
Thus, when only the inflow path L5 is congested and the right turn traffic volume of the inflow path L5 is greater than the right turn traffic volume of the inflow path L1, the time difference display 1φ-2 is adopted. By selecting “Pattern 2”, it is possible to efficiently increase the right turn traffic volume of the inflow path L5 without giving a wasteful blue time in the time difference display 1φ-2 and the next right turn display 2φ.

On the other hand, when it is determined that the control unit 101 does not exceed the predetermined value (NO in step S28), the time difference indications 1φ-1 and 1φ-2 are not adopted as the indication methods of the intersection IS (bidirectional current indication). “Pattern 3” in the main direction (in which the indication 1φ-3 is adopted) is selected (step S30).
This is because when there is not much difference between the right turn traffic volume of the inflow path L5 and the right turn traffic volume of the inflow path L1, it is sufficient to obtain the right turn traffic volume of both inflow paths at the right turn indication 2φ.

  When the control unit 101 determines in step S27 that only the inflow path L5 is not congested in the main direction (NO in step S27), the time difference display 1φ− 1. Select “Pattern 3” in the main direction that does not adopt 1φ-2 (adopts bidirectional display 1φ-3) (step S30). The reason is that, as in the first embodiment, it can be determined that there is no traffic jam in either the inflow channel L1 or the inflow channel L5, or that there is traffic jam in either the inflow channel L1 or the inflow channel L5. This is because it is preferable not to give the right of passage preferentially to one of the inflow paths L1 and L5 but to give the right of passage equally to both inflow paths.

  If the control unit 101 determines in step S22 that the traffic information in the main direction is abnormal (YES in step S22), the time difference display 1φ-1, 1φ− is used as the display method of the intersection IS. “Pattern 3” in the main direction that does not adopt 2 (adopts bidirectional display 1φ-3) is selected (step S30). The reason is “Pattern 1” or the time difference indication that adopts the time difference indication 1φ-1 when it is determined that at least one of the traffic information of the inflow paths L1 and L5 is abnormal as in the first embodiment. This is because if “Pattern 2” adopting 1φ−2 is selected, there is a possibility that the traffic congestion will be further deteriorated in the traffic inflow route that is congested, or that a wasteful blue time may be generated in the vacant inflow route. If you select “Pattern 3”, which uses the bidirectional 1φ-3, which has little influence on the traffic situation of both inflow channels, there is a possibility that the traffic congestion will worsen in the congested inflow route and The possibility that a useless blue time is generated can be reduced, which is preferable.

  In addition, when it is determined in step S23 that the information on the right turn traffic volume in the main direction is abnormal (YES in step S23), the control unit 101 sets the time difference display 1φ-1 as the display method of the intersection IS. “Pattern 3” in the main direction that does not adopt 1φ-2 (adopts bidirectional display 1φ-3) is selected (step S30). Since the right turn traffic volume is relatively easy to change from cycle to cycle, it is important to accurately grasp the right turn traffic volume of both inflow paths for each cycle. This is because if the right turn traffic volume cannot be accurately grasped, the right turn vehicle cannot be properly driven, and this may cause traffic congestion upstream of the inflow path. Therefore, when it is determined that the traffic information in each right turn direction of the opposite inflow path is abnormal, “Pattern 2” adopting the time difference indication 1φ-1 and “Pattern 2” adopting the time difference indication 1φ-2. "Is not selected, and" Pattern 3 "is preferably selected that employs the bidirectional display 1φ-3 that has little influence on the traffic situation of both inflow paths.

  The control unit 101 executes the processes of steps S31 to S40 also in the sub direction. Since the processing is performed by applying the inflow channels L7 and L3 in place of the inflow channels L1 and L5 of the processing in steps S21 to 30 in the main direction, a detailed description thereof will be omitted.

  As described above, the traffic signal controller 1 according to the second embodiment can display either the time difference display or the bidirectional display according to the determination result of whether or not the traffic information in the right turn direction of the opposite inflow path is abnormal. Therefore, even if the traffic information in the right turn direction of both inflow paths is abnormal, it is possible to appropriately determine whether to apply the time difference display.

The embodiments disclosed this time (including the above-described Embodiments 1 and 2) are illustrative and non-restrictive in every respect. The scope of right of the present invention is not the above-described embodiment, but includes all modifications within the scope equivalent to the scope of claims.
For example, in the above-described embodiment, the control unit 101 of the traffic signal controller 1 performs the movement control (FIGS. 3, 5, and 6), but the traffic signal control is performed by the control unit of the central device 4. It may be. That is, the central device 4 may execute the procedures of the flowcharts of FIGS. 3, 5, and 6 and send a “step command” based on the result to the traffic signal controller 1.

  In the above-described embodiment, the configuration is such that the abnormality is determined for the traffic information calculated from the sensor information of the vehicle detector. However, the present invention is not limited to this, and the abnormality of the sensor information itself of the vehicle detector is determined. It may be configured to do so. In this case, for example, when the pulse signal indicating vehicle on / off every 100 msec is continuously off for 2 hours or more, or is continuously on for 20 hours or more, the sensor information is abnormal. Can be determined. Then, when it is determined that the sensor information of the vehicle detector installed in at least one of the inflow channels facing each other is abnormal, the control that adopts the bidirectional display without adopting the time difference display. Can be executed.

In addition, the movement control sets two independent display orders (rings) in the inflow paths opposite to each other, and changes the switching timing of each ring in accordance with traffic conditions, resulting in the appearance of a time difference display. It may be realized by a so-called “dual ring method” (the method of the above-mentioned Patent Document 1 (Japanese Patent Laid-Open No. 2006-268547)) or may be realized by other methods.
In short, the movement control only needs to be able to dynamically determine whether or not the time difference display is generated according to the traffic situation of the inflow route, and if it is a control logic that can realize this determination, it is specific. It is not limited.

  In the above-described embodiment, the central device 4 calculates traffic information (for example, the congestion length of the inflow path) and right-turn traffic information used for movement control, and calculates the calculated traffic information and right-turn traffic information as traffic. Although used by the signal controller 1, the control unit 101 of the traffic signal controller 1 performs the movement control using the sensor information of the vehicle sensor 3 and the sensor information near the intersection of the image type vehicle sensor 6. Necessary traffic information and right-turn traffic information may be calculated.

  Further, in the above-described embodiment, the central device 4 detects abnormality of traffic information and right turn traffic information, transmits the abnormality information to the traffic signal controller 1, and based on the abnormality information received by the traffic signal controller 1. However, the control unit 101 of the traffic signal controller 1 detects an abnormality in the traffic information and right-turn traffic information received from the central device 4 (determination). The control unit 101 itself may use the sensor information of the vehicle sensor 3, the traffic information necessary for movement control using the sensor information near the intersection of the image type vehicle sensor 6, and the information of the right turn traffic volume. And the abnormality of the calculated traffic information and right turn traffic information may be detected (determined).

Further, in the above-described embodiment, the traffic signal controller 1 is configured to execute movement control in which either one of the time difference display and the bidirectional display can be selected in the middle of the cycle, but is not limited thereto. The configuration may be such that status change control capable of selecting either a time difference display or a bidirectional display at the start of a cycle may be executed.
At intersections where movement control is performed, it is often an intersection where the amount of right-turn traffic is likely to fluctuate every cycle, so it is important to accurately grasp traffic information for each cycle of the opposite inflow path in real time. . This is because, if the traffic information for each cycle cannot be accurately grasped in real time, the right turn vehicle in the cycle cannot be properly driven or there is a risk of causing traffic congestion on the inflow path. Therefore, the configuration of performing the time difference display or the bidirectional display selection process according to the determination result of whether or not the traffic information of the opposite inflow path is abnormal is particularly a traffic signal controller that executes movement control. Suitable for (traffic signal control device).

  In the above-described embodiment, the traffic signal controller 1 is configured to select one of the time difference display and the bidirectional display. However, the present invention is not limited to this. It may be configured to select a time difference display or a bidirectional display from three or more displays including other displays.

DESCRIPTION OF SYMBOLS 1 Traffic signal controller, 101 Control part, 102 Memory | storage part, 103 Communication part, 104 Lamp drive part 2 Signal lamp, 3 Vehicle detector, 4 Central apparatus, 5 Vehicle, 6 Image-type vehicle sensor IS Intersection, L1, L3, L5, L7 inflow path, L2, L4, L6, L8 outflow path

Claims (6)

A traffic signal control device that dynamically determines whether or not a time difference indication is applicable to an inflow path facing at an intersection,
Traffic information acquisition means for acquiring traffic information of the opposite inflow channel;
Based on the traffic information acquired by the traffic information acquisition means, a control means for executing a selection process capable of selecting any of a plurality of indications including a time difference indication as the indication of the intersection;
An abnormality determining means for determining whether or not the traffic information acquired by the traffic information acquiring means is abnormal,
The said control means is a traffic signal control apparatus which is made to perform the said selection process further according to the determination result of the said abnormality determination means. When the control means determines that the abnormality determination means is abnormal, the control means selects a plurality of selectable indications other than the time difference indication.
The traffic signal control device according to claim 1. When the control means determines that the abnormality determination means is abnormal, the control means selects a bidirectional display that gives a right of passage to both of the opposing inflow paths;
The traffic signal control device according to claim 1 or 2. The traffic information acquired by the traffic information acquisition means includes traffic information of each right turn direction at the intersection of the inflow path,
The control means is configured to execute the selection process based on traffic information in each right turn direction at the intersection of the inflow path acquired by the traffic information acquisition means.
The traffic signal control device according to any one of claims 1 to 3. The control means is configured to be able to execute the selection process in the middle of a cycle.
The traffic signal control device according to claim 1. A traffic signal control method for dynamically determining whether a time difference indication is applicable to an inflow path facing at an intersection,
A traffic information acquisition step of acquiring traffic information of the opposite inflow path;
Based on the traffic information acquired in the traffic information acquisition step, a control step of executing a selection process capable of selecting any of a plurality of indications including a time difference indication as the indication of the intersection;
An abnormality determination step for determining whether or not the traffic information acquired in the traffic information acquisition step is abnormal,
The traffic signal control method, wherein the control step further executes the selection process according to a determination result of the abnormality determination step.

Images