JP2000172987A - Controller for road construction traffic signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make relievable traffic jam when the traffic volume is one-sided by detecting via a vehicle sensor and a vehicle stoppage time counter contained in a traffic signal controller that no entering vehicle is confirmed in the opposite lane and also a stopped vehicle kept for a fixed time in a signal waiting state is confirmed respectively. SOLUTION: When a stopped vehicle that is kept for a fixed time in a signal waiting state is confirmed even if no entering vehicle is confirmed in the opposite lane, a vehicle sensor 1a or 1b detects a vehicle 11 and a vehicle stoppage time counter 7a or 7b starts to count the time. When the count value of the counter exceeds a prescribed threshold, a switch control circuit 10 receives the output of the count value and actuates a switch 8 to switch a blue signal to a red one of a traffic signal 5b. Then a vehicle 12 which traveled ahead while watching the blue signal of the signal 5 actuates the switch 8 to switch the red signal to the blue one after a time when the vehicle 12 passed through a construction section 3 has passed. As a result, a traffic jam can be relieved even if the traffic volume is one-sided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for controlling the flow of vehicles by means of a traffic signal in one-way alternate traffic due to construction on the road or the like. The present invention relates to a traffic signal control device for road works capable of efficiently controlling a traffic signal according to a traffic congestion situation.

[0002]

2. Description of the Related Art At present, the Ministry of Construction works in cooperation with the National Police Agency to drastically reduce road construction and level the construction to reduce traffic congestion due to road construction. Due to this effect, for example, the number of on-street constructions in Tokyo-ku decreased from 16472 in 1992 to 9071 in 1997, and the length of construction traffic congestion was also reduced to one day on March 12, 1998. It is announced that the traffic volume is 6.3km for 31,000 vehicles.

[0003] By the way, the effect of alleviating traffic congestion has been improved by reducing the number of road works, but in traffic signal control accompanying road works, control is performed so that a traffic accident due to vehicle entry from both sides into the work section does not occur. The control is not performed according to the traffic flow and congestion at that time. As a signal control method adapted to traffic flow, there is an A-type program multi-stage traffic signal controller, but it is expensive to apply to a temporary construction section. On the other hand, there is a method in which traffic coordinators communicate with each other on both sides of the construction section to instruct vehicles to enter the construction section.However, traffic accidents due to human error and difficulty in seeing at night make traffic coordination difficult. There is a risk of being involved in an accident.

FIG. 10 shows a conventional road construction traffic signal control device, wherein 2 is a road, 3 is a construction section on the road 2,
4a and 4b are vehicle stop lines provided on both sides of the construction section 3, 5a and 5b are traffic lights placed near the vehicle stop lines 4a and 4b, and 6 is a display signal of a blue and red light of the traffic signal 5. A traffic signal controller 8 for switching between the traffic signals 5a and 5b, and a timer for notifying that the time of the blue and red signals of the traffic signals 5a and 5b has passed; Reference numeral 10 denotes a switch control circuit that controls the switching of the switch 8 according to the output of the timer 9. The switch 8, the timer 9, and the switch control circuit 10 are provided inside the traffic signal controller 6. Numeral 11 denotes a vehicle that has entered the construction section 3 with the green light of the traffic light 5b, and numeral 12 indicates a vehicle that is stopped near the vehicle stop line 4a with a red light of the traffic light 5a.

Next, the operation will be described. The traffic signal controller 6 includes a switch 8, a timer 9, and a switch control circuit 10 therein. The switch 8 is blue only for the traffic signal 5a (when the switch control circuit 10 and the traffic signal 5a are connected in FIG. 6), Only the traffic light 5b is blue (when the switch control circuit 10 and the traffic light 5b are connected as shown in FIG. 6), and both the traffic light 5a and 5b are red (in FIG. 6, the switch 8 is in the neutral state and the switch control circuit 10 and the traffic light 5a or 5b is not connected). To switch the switch 8, the switch control circuit 10 sets a timer value in a timer 9 according to the state of the switch 8 at that time, starts the timer 9, receives an output indicating that the timer 9 has elapsed, and activates the switch 8. By repeating the switching, the above three switch states are controlled at predetermined time intervals. in this case,
Before the vehicle 11 that has entered the construction section 3 with the green signal display of the traffic signal 5b passes through the construction section 3, the traffic signal 5a on the opposite side turns blue and the vehicle 12 that has stopped in front of the vehicle stop line 4a becomes the construction section. There is provided a time during which the traffic lights 5a and 5b both become red lights for a sufficiently long time so that the traffic light 3 does not enter.

[0006]

The conventional traffic signal control device for road construction has the above-described configuration, and does not perform signal control according to the presence or absence of a stopped vehicle or a vehicle passing through a construction section and traffic congestion. There was a problem that it was not effective in alleviating traffic congestion. On the other hand, there is a means for traffic controllers to control traffic according to the traffic volume.However, especially at night, depending on the surrounding darkness and the direction of the headlights, it becomes difficult for the driver to see the traffic controller, and the traffic controller may be in an accident. There was a problem that there was a possibility of being swallowed.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a road construction traffic signal control device capable of efficiently controlling a construction traffic signal according to a traffic flow while being unmanned. It is an object.

[0008]

According to a first aspect of the present invention, there is provided a traffic signal control device for road construction, wherein a vehicle sensing device is provided near a vehicle stop position on both sides of a construction section of the conventional device, and a stop time counter is added to the traffic signal controller. This is the configuration.

In the traffic signal control device for road construction according to the second invention, a visible camera for photographing a vehicle stop position on both sides of the construction section and an upstream side of the road is provided in the conventional device, and the visible camera and the traffic signal controller are provided between the visible camera and the traffic signal controller. And a timer value calculation circuit is added to the traffic signal controller.

Further, the road construction traffic signal control device according to the third invention has a configuration in which an infrared camera is provided instead of the visible camera of the road construction traffic signal control device according to the second invention.

Further, a road construction traffic signal control device according to a fourth aspect of the present invention includes, in addition to the road construction traffic signal control device according to the first aspect, a plurality of vehicle detectors at entrances on both sides of the road construction section; This is a configuration in which a vehicle counter is added to the signal controller.

Further, a road construction traffic signal control device according to a fifth aspect of the present invention includes a road construction traffic signal control device according to the second aspect of the present invention,
An image vehicle measuring device for measuring a vehicle occupation range in a road construction section by image processing from a video signal output from the visible camera is added.

Further, the road construction traffic signal control device according to the sixth invention has a configuration in which an infrared camera is provided instead of the visible camera of the road construction traffic signal control device according to the fifth invention.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is a block diagram showing Embodiment 1 of the present invention. The embodiment is
Since the road construction varies depending on the season, time, and the like, the general construction is used here. In the figure, reference numerals 2 to 6 and 8 to 12 are the same as those of the conventional apparatus. 1
Reference numerals a and 1b denote vehicle detectors for detecting vehicles that stop before or pass the vehicle stop lines 4a and 4b before the vehicle stop lines 4a and 4b, and 7a and 7b are inside the traffic signal controller 6, and That the sensors 1a and 1b are continuously detecting the vehicle, that is, the vehicle is stopped for a certain period of time.
This is a stop time counter that notifies that the vehicle is stopped before a and 4b.

Next, the operation will be described. FIG. 2 shows a timing chart of main signals as an example. When the vehicle detectors 1a and 1b do not detect the vehicle, the switch control circuit 10 sets the timer value to the timer 9 according to the state of the switch 8 at that time and activates the same as in the conventional device,
The timer 9 receives the output indicating that the duration has elapsed, and repeatedly switches the switch 8,
At a predetermined time interval, the traffic signal 5a repeats a state of blue, the traffic signals 5a and 5b are red, the traffic signal 5b is blue, and the traffic signals 5a and 5b are red. here,
When only the traffic signal 5b (or 5a) is blue and the vehicle detector 1a (or 1b) detects the vehicle 11, the stop time counter 7a (or 7b) starts counting up and the count value is set in advance. When the threshold value is exceeded, the switch control circuit 10 receives this output,
The switch 8 is switched so that the traffic light 5b is changed from a green light to a red light. Next, after a lapse of time until the vehicle 12 entering the vehicle while seeing the green signal of the traffic signal 5b passes through the construction section 3, the switch 8 of the traffic signal 5a is switched to a green signal. The stop time counter 7a (or 7b)
When the vehicle sensor 1b (or 1a) on the opposite lane detects a vehicle after the start of counting up, the counting up is reset.

As described above, in the first embodiment, if there is a stopped vehicle that has been waiting for a traffic light and a certain time has elapsed even though there is no vehicle in the opposite lane, the traffic signal on the opposite lane is changed to a red light. Since the traffic light on the stationary vehicle is switched to the green light earlier than usual, there is an advantage that traffic congestion can be reduced when the traffic volume is uneven to one side.

Here, the most general methods such as a method of displaying a vehicle stop position and a method of sensing a vehicle have been described.
In practice, various types are used depending on the season or time at which road construction is performed. For example, in the case where snow is assumed, as a method of displaying the vehicle stop position, a downward arrow may be provided above the stop position of the road instead of or in combination with the stop line, as in the above embodiment. Can work.

Embodiment 2 FIG. FIG. 3 is a block diagram showing a second embodiment of the present invention. In the first embodiment, the vehicle detectors 1a and 1b and the stop time counters 7a and 7b inside the traffic signal controller 6 are deleted. 5a, 5b
Are provided with visible cameras 13a and 13b in the vicinity of, image vehicle measuring devices 14a and 14b between the visible cameras 13a and 13b and the traffic signal controller 6, and a timer value calculation circuit 15 inside the traffic signal controller 6. It is.

In the second embodiment, the traffic signal switching control is determined not only by the presence or absence of one vehicle waiting for a signal and by the presence or absence of the vehicle entering the opposite lane, but also by measuring the vehicle occupation range corresponding to the traffic congestion amount. By controlling the time of the green signal according to the value, it can be used to alleviate traffic congestion. This operation will be described.
The visual cameras 13a and 13b capture an image of the roadway on the upstream side from the vicinity of the vehicle stop lines 4a and 4b.
a and 14b input the images of the visible cameras 13a and 13b and calculate the vehicle occupation range. The timer value calculation circuit 15 of the traffic signal controller 6 includes the image vehicle measurement devices 14a and 14
Based on the time average of the vehicle occupation ranges ya and yb output by b, the reference time t0 of the green signal, and the constant k, the times ta and tb of the green signals of the traffic signals 5a and 5b are calculated as follows.

[0020]

(Equation 1)

FIG. 4 shows a method of calculating the vehicle occupation ranges ya and yb in the image vehicle measurement devices 14a and 14b.
This will be described in (a) to (d). First, the visible camera 13a,
The difference image between the background image “see FIG. 4 (a)” stored when the image of 13b is not present and the original image “see FIG. 4 (b)” at the time of measuring the vehicle occupation range is shown in FIG. (C), and extracts a portion of the difference image that is on the upstream side of the road and has a change (see FIG. 4 (d)), and extracts the extracted portion in the depth direction (y-axis direction). The size is calculated as the vehicle occupation range. Accordingly, as the traffic congestion amount or the traffic amount increases, the vehicle occupation range value increases, and the control is performed so that the time of the green signal becomes longer as shown in the above equation.

The method of calculating the vehicle occupation ranges ya and yb in the image vehicle measurement devices 14a and 14b has been described in a simple manner in the above-described embodiment. In addition, for example, in June 1993 ( The traffic congestion amount (vehicle number) can be measured by various image processing devices that can detect the number of vehicles passing, their speed, and stopped vehicles described in the “Joint Research Report on Traffic Flow Monitoring System Using Image Processing” issued by Dosys Corporation. It can also be used as a vehicle occupation range.

As described above, in the second embodiment, the method of controlling the green signal time in accordance with the traffic congestion amount or the traffic amount,
It has the advantage of reducing traffic congestion.

Embodiment 3 FIG. FIG. 5 is a block diagram showing a third embodiment of the present invention. In place of the visible cameras 13a and 13b of the second embodiment, infrared cameras 16a and 16a are used.
6b.

The infrared cameras 16a and 16b receive infrared rays emitted from a control object and obtain a two-dimensional image according to the intensity of the infrared rays. Thus, even if there is no night illumination, equivalent images can be obtained during the day and night. . Also, the vehicle occupation range ya, y
The calculation method of “b” in the image vehicle measurement devices 14a and 14b can be obtained by the same method as that shown in FIGS.

As the infrared cameras 16a and 16b, uncooled infrared cameras capable of continuous operation at room temperature have recently been marketed, and have a resolution of about 70,000 pixels, which is sufficient for measuring the vehicle occupation range. . In addition, it is possible to take a picture through an opaque infrared window through which visible light does not pass, and there is no problem of privacy infringement because a human phase is not shown in the infrared image.

As described above, the third embodiment has an advantage that the traffic congestion can be alleviated by controlling the green light time according to the traffic congestion amount or the traffic volume throughout the day and night.

Embodiment 4 FIG. 6 is a block diagram showing a fourth embodiment of the present invention. In the first embodiment, vehicle detectors 1c, 1d, 1e, 1f and vehicle counters 17a, 17b are provided inside traffic signal controller 6. Things.

The vehicle detectors 1c, 1d and 1e,
1f are installed at the entrance and exit of the construction section 3 in a row in the direction of travel of the vehicle, and the number of vehicles entering and exiting is measured by the vehicle counter 17 inside the traffic signal controller 6 from the time sequence of this detection. Can be. Since the absolute value of the output of the vehicle counter 17 corresponds to the number of vehicles in the construction section 3 and the sign corresponds to the traveling direction of the vehicle, the output of the vehicle counter 17 becomes 0 when the output of the vehicle counter 17 becomes 0. The switch control circuit 10 determines that there is no vehicle, and the switching control of the traffic signals 5a and 5b can be used to alleviate traffic congestion.

This operation will be described as an example with reference to timing charts of main signals in FIG. When the vehicle sensors 1a and 1b do not detect the vehicle, the conventional device and the first embodiment are used.
Similarly, the switch control circuit 10 repeatedly switches the switch 8 at predetermined time intervals, so that the traffic signal 5a is blue, the traffic signals 5a and 5b are red, the traffic signal 5b is blue, and the traffic signals 5a and 5b. Both repeat the state of red. The vehicle counter 17 includes the vehicle detector 1
When the output is received in the order of f and 1e, it is determined that one vehicle has entered from the traffic light 5b side, and the vehicle counter is incremented by +1. In addition, the vehicle counter 17 includes the vehicle detectors 1f and 1f.
When the outputs are received in the order of e, it is determined that one vehicle has exited from the traffic light 5a side, and the vehicle counter is decremented by one. vice versa,
When receiving the output in the order of the vehicle detectors 1a and 1b, the vehicle counter 17 determines that one vehicle has entered from the traffic light 5a side, and increments the vehicle counter by +1. When receiving the output in the order of the vehicle detectors 1e and 1f, the vehicle counter 17 determines that one vehicle has exited from the traffic signal 5b side and decrements the vehicle counter by -1. In the normal signal control shown in FIG. 7, the vehicle that has entered the construction section 3 with the green light of the traffic signal 5b sequentially passes through the vehicle sensors 1f and 1e, the output of the vehicle counter 17 becomes +1 and the vehicle detector 17 exits at the construction section. When the vehicle passes through 1d and 1c sequentially, the vehicle counter output is decremented by one and returned to zero. Next, in the example of signal switching control based on vehicle detection in FIG. 7, the traffic signal 5b (or 5)
When the vehicle sensor 1a (or 1b) detects the vehicle 11 only in the state of blue in (a), the stop time counter 7a (or 7b) starts counting up and the count value exceeds a preset threshold value. And the switch control circuit 10 receives this output, and switches the switch 8 so that the traffic light 5b changes from a green signal to a red signal. here,
If the output of the vehicle counter 17 becomes 0, it means that no approaching vehicle remains in the construction section 3, and
The switch 8 is switched to a green light for the traffic light 5a.

As described above, in the fourth embodiment, if there is a stopped vehicle that has been waiting for a traffic light and a certain time has passed even though there is no vehicle in the opposite lane, the traffic signal on the opposite lane is changed to a red light. Switching and judging that there are no ingress vehicles in the construction section, the time during which both lanes become red light can be controlled to be short, so that there is an advantage that congestion can be alleviated more quickly when traffic volume is uneven to one side.

Embodiment 5 FIG. 8 is a block diagram showing Embodiment 5 of the present invention.
One visible camera 13c for photographing the inside of the construction section on one side of the road construction section, and an image vehicle measuring device 14c for measuring a vehicle occupation range in the construction section 3 by image processing from a video signal output from the visible camera 13c. It is provided.

The time of the green light of the traffic signals 5a and 5b is
Image vehicle measuring devices 14a, 14b as in the second embodiment.
Is calculated using the vehicle occupation ranges ya and yb obtained in the above. In the fifth embodiment of the present invention, the vehicle occupation range in the construction section can be measured by the image vehicle measurement device 14c from the video signal output from the visible camera 13c by the same image processing as in the second embodiment. When there is no vehicle in the construction section 3, the vehicle occupation range in the construction section 3 becomes 0, so that the traffic signal on the opposite lane and the traffic signal on the opposite lane can be switched to blue immediately.

As described above, in the fifth embodiment, the green signal time is controlled in accordance with the traffic congestion amount or the traffic amount, and it is determined that there are no vehicles in the construction section. Has the advantage that traffic congestion can be further reduced.

Embodiment 6 FIG. FIG. 9 is a block diagram showing Embodiment 6 of the present invention.
One infrared camera 16c for photographing the inside of the construction section on one side of the road construction section, and an image vehicle measuring device 14c for measuring a vehicle occupation range in the construction section 3 by image processing from a video signal output from the infrared camera 16c. It is provided.

The infrared camera 16c is an infrared camera 16c.
It is the same kind as a, 16b, which receives infrared rays emitted from the object and obtains a two-dimensional image according to its intensity. Even if there is no nighttime illumination, or if there is strong illumination in the construction section, The same image can be obtained day and night. From the video signal output from the infrared camera 16c, the vehicle occupation range in the construction section can be measured by the image vehicle measuring device 14c by the same image processing as in the third embodiment. Further, similarly to the fifth embodiment, when there is no vehicle in the construction section 3, the vehicle occupation range in the construction section 3 becomes 0.
The traffic light on the opposite lane and the traffic light that was switched to the red light immediately can be switched to blue.

As described above, in the sixth embodiment, during the daytime and nighttime, the green signal time is controlled in accordance with the traffic congestion amount or the traffic amount, and it is determined that there are no vehicles entering the construction section. Since the signal time can be controlled to be short, there is an advantage that traffic congestion can be further reduced.

As described above, in the fourth to sixth embodiments, the same means (vehicle detector, visible camera, etc.) are used as the means for detecting the amount of congestion or traffic and the means for detecting whether there are any vehicles entering the construction section. , Or an infrared camera), but it is obvious that they can be combined and implemented as separate means.

[0039]

According to the first aspect of the present invention, it is detected by the vehicle detector and the stop time counter in the traffic signal controller that there is no approaching vehicle on the opposite lane side and there is a stopped vehicle that has passed a certain period of time while waiting for a traffic light. Since the traffic signal on the opposite lane can be switched to a red light and the traffic signal on the stopped vehicle can be switched to a green signal earlier than usual, the traffic congestion can be reduced when the traffic volume is uneven to one side. .

According to the second aspect of the present invention, the image captured by the visible camera can be measured by the image processing of the image vehicle measuring device to measure the vehicle occupation range corresponding to the amount of traffic congestion accompanying the construction regulation. Based on the result, the traffic signal controller internal timer value calculation circuit can control the traffic congestion amount or the green signal time on the lane side where the traffic volume is large, so that the traffic congestion can be alleviated.

According to the third aspect of the present invention, the image captured by the infrared camera can be image-processed by the image-vehicle measuring device to measure the vehicle occupation range corresponding to the amount of congestion accompanying construction regulations. Based on the result, the traffic signal controller internal timer value calculation circuit can control the traffic congestion amount or the green light time on the lane side where the traffic volume is large, so that there is an advantage that the traffic congestion can be alleviated regardless of day or night.

According to the fourth aspect of the present invention, it is detected by the vehicle detector and the stop time counter in the traffic signal controller that there is no approaching vehicle on the opposite lane side and there is a stopped vehicle for which a certain time has elapsed while waiting for a traffic light. Then, the traffic signal on the opposite lane side is switched to a red light, the vehicle detector and the vehicle counter detect that there is no vehicle in the construction section, and the signal for the stopped vehicle can be immediately switched to the green signal. There is an effect that traffic congestion can be alleviated when the traffic volume is uneven.

According to the fifth aspect of the present invention, the image taken by the visible camera is subjected to image processing by the image vehicle measuring device, so that the vehicle occupation range corresponding to the traffic congestion amount due to the construction regulation on both sides of the construction section. And the vehicle occupied area of vehicles passing through the construction section can be measured, and based on this measurement result, the traffic signal controller's internal timer value calculation circuit controls the traffic light amount or the green light time on the lane side with a lot of traffic for a long time Yes, it detects that there are no vehicles in the construction section, and both lanes can quickly switch to the green light with a short red light time,
It has the advantage of reducing traffic congestion.

According to the sixth aspect of the present invention, the image taken by the infrared camera is subjected to image processing by the image vehicle measuring device, so that the vehicle occupation range corresponding to the traffic congestion amount due to the construction regulation on both sides of the construction section. And the vehicle occupation range of vehicles passing through the construction section can be measured.Based on this measurement result, the traffic signal controller's timer value calculation circuit can control the traffic light amount or the green light time on the lane side where the traffic volume is large. , It detects that there are no vehicles in the construction section, and both lanes can switch the red signal time to the green signal immediately and quickly,
It has the advantage of reducing traffic congestion both day and night.

[Brief description of the drawings]

FIG. 1 is a diagram showing a first embodiment of a road construction traffic signal control device according to the present invention.

FIG. 2 is a diagram showing Embodiment 1 of a road construction traffic signal control device according to the present invention.

FIG. 3 is a diagram showing a second embodiment of the road construction traffic signal control device according to the present invention;

FIG. 4 is a diagram showing a second embodiment of the road construction traffic signal control device according to the present invention;

FIG. 5 is a diagram showing Embodiment 3 of a road construction traffic signal control device according to the present invention.

FIG. 6 is a diagram showing a fourth embodiment of a road construction traffic signal control device according to the present invention.

FIG. 7 is a diagram showing a fourth embodiment of a road construction traffic signal control device according to the present invention.

FIG. 8 is a diagram showing a fifth embodiment of a road construction traffic signal control device according to the present invention.

FIG. 9 is a diagram showing a sixth embodiment of the road construction traffic signal control device according to the present invention.

FIG. 10 is a diagram showing an embodiment of a conventional road construction traffic signal control device.

[Explanation of symbols]

1 vehicle detector, 2 roads, 3 construction sections, 4 vehicle stop line, 5 traffic signal, 6 traffic signal controller, 7 stop time counter, 8 switch, 9 timer, 10
Switch control circuit, 11 entering vehicle, 12 stopped vehicle, 13 visible camera, 14 image vehicle measuring device, 15 timer value calculation circuit, 16 infrared camera, 1
7 Vehicle counter.

Claims (6)

[Claims] 1. A vehicle sensor responsive to vehicles approaching a vehicle stop position provided on both sides of a road construction section and approaching the road construction section and stopping at the vehicle stop position, and the vehicle stop position A traffic signal installed in the vicinity, a timer for measuring a fixed time, and a traffic signal for switching and controlling the traffic signal displayed by the traffic signal by a stop time counter activated by a vehicle detection signal output by the vehicle sensor. It is composed of a controller, and switches the traffic signal display of the traffic signal at normal times with the time of the green signal and the red signal fixed, and continuously detects the vehicle waiting for the signal at the red signal, and enters the vehicle at the green signal side A traffic light control device for road works, wherein a green signal is switched to a red signal before a predetermined time has elapsed when no traffic signal is detected. 2. A visible camera installed on both sides of a road construction section so that the vicinity of a vehicle stop position and an upstream side of the road are in view, and a video signal output from the visible camera is processed by image processing on both sides of the road construction section. An image vehicle measurement device that measures the occupied range or the number of vehicles traveling or stopped on each road, a traffic signal installed near the vehicle stop position, and a vehicle occupancy or output ratio output by the image vehicle measurement device. It is composed of a traffic signal controller that switches and controls the traffic signal displayed by the traffic signal according to the number of vehicles and the timer, and the occupied area of the traveling or stopped vehicle on the road on each side of the road construction section is large or the number of vehicles is large A traffic light control device for road works, wherein the green light time of one of the traffic lights is controlled to be longer. 3. An infrared camera installed on both sides of the road construction section so that the vicinity of the vehicle stop position is in the field of view, and image signals output from the infrared camera are processed on both sides of the road construction section by image processing. 3. The traffic signal control device for road construction according to claim 2, further comprising an image vehicle measuring device for measuring an occupied range or the number of vehicles traveling or stopped on the road. 4. A vehicle sensor responsive to vehicles approaching and stopping at a vehicle construction position provided near vehicle stop positions provided on both sides of the road construction region, respectively. A plurality of vehicle sensors provided at entrances on both sides, traffic signals installed near the vehicle stop position, a timer for measuring a fixed time, and a vehicle output by the vehicle sensors near the vehicle stop position The above traffic signal is displayed by the stop time counter activated by the detection signal and the vehicle counter that counts the number of traveling vehicles existing in the road construction section from the vehicle detection signal output by multiple vehicle detectors at the entrance to the road construction section Traffic light controller that switches and controls the traffic light to be displayed. Switch as a constant, continue to detect vehicles waiting for a signal at the red light, and if not detect vehicles approaching the green signal, switch the green signal to the red signal before the fixed time elapses. A traffic signal control device for road works, wherein it is determined that there is no vehicle in a section and a red signal on a signal waiting side is switched to a green signal. 5. A visible camera provided on both sides of a road construction section and installed near the vehicle stop position and in view of the upstream side of the road, and a visible camera installed to photograph the inside of the road construction section. An image-vehicle measuring device that measures the occupied area or the number of vehicles traveling or stopped on the road on each side of the road construction section and in the construction section by image processing from the video signal output by the visible camera, and near the vehicle stop position And a traffic signal controller that switches and controls the traffic signal displayed by the traffic signal using a timer that measures a vehicle occupancy or the number of vehicles output by the image vehicle measurement device and a fixed time. The traffic signal display on the traffic signal is switched at normal times with the green signal and red signal times kept constant. Control so that the green signal time of the traffic signal with the larger occupation range or the number of vehicles is longer, and if it is determined that there is no vehicle in the construction section, the time that both sides are red signals is switched to shorter. A traffic signal control device for road works, characterized in that: 6. An infrared camera installed on both sides of a road construction section and installed near the vehicle stop position and in view of the upstream side of the road, and an infrared camera installed to photograph the inside of the road construction section. An image-vehicle measuring device for measuring an occupied range or the number of vehicles traveling or stopped on the road on each side of the road construction section and in the construction section by image processing from a video signal output from the infrared camera. The road construction traffic signal control device according to claim 5, wherein