JP6983632B2 - Traffic flow monitoring system in the tunnel - Google Patents

Description

The present invention relates to an in-tunnel traffic flow monitoring system in which a vehicle sensor is provided in a fire hydrant device installed in a tunnel to monitor a vehicle traffic state in the tunnel.

Conventionally, the congestion phenomenon on a highway has been defined as "a state in which a 1-kilometer line of vehicles continues to extend for 15 minutes or more at a speed of 40 km / h or less". A traffic counter with an ultrasonic sensor embedded in the road about every two kilometers measures the number of vehicles, vehicle speed, and vehicle length.

On the other hand, the state of traffic congestion in a tunnel on a highway is grasped by checking the number of vehicles with a camera installed at the tunnel entrance. This kind of traffic jam phenomenon occurs when you drive on a bright road until you enter the tunnel, and when you enter a dark tunnel, you will be dazzled for a moment, and people will feel dangerous and the speed of the car will slow down. , It is a factor that causes traffic congestion when entering a tunnel.

Japanese Unexamined Patent Publication No. 2003-288673 Japanese Unexamined Patent Publication No. 2009-279294

However, grasping the state of traffic congestion in such a conventional tunnel is only for grasping the state of traffic congestion in the vicinity of entering the tunnel by checking the number of units with a camera installed at the tunnel entrance, which is especially for emergency use. When the equipment is in operation, it is required to accurately grasp the congestion situation over the entire length of the tunnel.

In order to solve this problem, it is conceivable to measure the number of vehicles, vehicle speed and vehicle length with a traffic counter in which a magnetic sensor or ultrasonic sensor is embedded in the road about every 2 kilometers in the tunnel, but the traffic counter Since the installation interval is too long, it is difficult to accurately grasp the congestion situation in the tunnel.

In addition, when a vehicle accident accompanied by a fire occurs in a tunnel, it is important to grasp the vehicle condition in the tunnel for evacuation guidance and firefighting activities, but effective measures have not been taken.

The present invention makes it possible to accurately grasp the traffic state of a vehicle in a tunnel and take necessary measures by installing a vehicle sensor using a device such as a fire hydrant device installed at a predetermined interval in the tunnel. The purpose is to provide a vehicle traffic flow monitoring system in a tunnel.

(Traffic flow monitoring system in tunnel)
The present invention relates to a traffic flow monitoring system in a tunnel.
Multiple fire hydrant devices that are installed at predetermined intervals in the longitudinal direction of the tunnel and pull out a hose with a nozzle housed in the housing to extinguish the fire.
A vehicle sensor that is placed for each of multiple fire hydrant devices and detects vehicles passing in front of the fire hydrant device,
A measuring unit that measures vehicle information including at least the number of passing vehicles and vehicle speed based on the detection signals of a pair of vehicle sensors arranged in the longitudinal direction of the tunnel.
A traffic judgment unit that determines and notifies the vehicle traffic condition in the tunnel based on the vehicle information measured by the measurement unit.
Is characterized by being provided.

(Measurement by a pair of vehicle sensors installed in the fire hydrant device)
A pair of vehicle sensors are placed near the left and right sides of the fire hydrant device in the longitudinal direction of the tunnel.
The measuring unit measures the vehicle information of the passing vehicle based on the detection signals of the pair of vehicle sensors arranged for each fire hydrant device.

(Measurement by a pair of vehicle sensors installed in the adjacent fire hydrant device)
A vehicle sensor is placed for each fire hydrant device,
The measuring unit measures the vehicle information of the passing vehicle based on the detection signals of the pair of vehicle sensors arranged in the fire hydrant devices adjacent to each other in the longitudinal direction of the tunnel.

(Vehicle sensor)
As the vehicle sensor, a magnetic sensor, an ultrasonic sensor or an infrared sensor is provided.

(Average vehicle speed distribution in the tunnel)
The traffic judgment unit obtains the average vehicle speed per unit time based on the vehicle speed of each installation location of the fire hydrant device, and notifies the distribution of the average vehicle speed in the tunnel.

(Average vehicle speed when there are no passing vehicles)
If the vehicle does not pass within the unit time for obtaining the average vehicle speed, the measuring unit keeps the average vehicle speed obtained within the unit time before that.

(Traffic congestion monitoring in the tunnel)
The traffic judgment unit sets a predetermined threshold number of vehicles that causes congestion according to the total length of the tunnel, and the number of vehicles passing through the tunnel obtained from the vehicle information measured by the measurement unit is equal to or greater than the threshold number. In some cases, the occurrence of traffic congestion is predicted and notified.

(Congestion monitoring in which the tunnel is divided into sections)
The traffic judgment department
The inside of the tunnel is divided into a plurality of traffic jam monitoring sections having a length that is a multiple of the installation interval of the fire hydrant device, and the threshold number of the predetermined section where the traffic jam occurs is set according to the length of the traffic jam monitoring section.
When the number of vehicles passing through the traffic jam monitoring section obtained from the vehicle information measured by the measuring unit exceeds the threshold number of the predetermined section, the occurrence of traffic jam is predicted and notified to the traffic jam monitoring section unit.

(Congestion occurrence standard)
The threshold number is set based on a predetermined congestion generation standard that congestion occurs when 25 or more vehicles are present in a section of one kilometer.

(Vehicle stop monitoring)
The traffic judgment unit determines and notifies the stop of the vehicle in the tunnel based on the vehicle information.

(Vehicle stop monitoring)
The traffic judgment unit installs a fire hydrant device for monitoring stopped vehicles, which is located at an installation interval that is the least common multiple of the predetermined vehicle stop interval expected when a vehicle passing through the tunnel stops and the installation interval of the fire hydrant device. Based on the vehicle information corresponding to the fire hydrant device for monitoring the stopped vehicle, the stopped vehicle in the tunnel is determined and notified.

(Vehicle stop monitoring)
The traffic determination unit determines that the vehicle is stopped when the vehicle detection signal is continuously output for more than a predetermined time from the vehicle sensor provided in the fire hydrant device for monitoring the stopped vehicle.

(Measurement of vehicle length and number of vehicles passing by vehicle type)
The measuring unit measures the length of the passing vehicle from the detection signal of the vehicle sensor.
The traffic judgment unit classifies the sizes of passing vehicles into a plurality of types based on the vehicle length, and obtains and notifies the number of passing vehicles for each type of classified vehicle.

(Basic effect)
The present invention is provided in a plurality of fire extinguishing devices that are installed at predetermined intervals in the longitudinal direction of the tunnel and pull out a hose with a nozzle housed in the housing to extinguish a fire. Based on the detection signals of the vehicle sensor that detects the vehicle to be used and the pair of vehicle sensors arranged in the longitudinal direction of the tunnel, the measurement unit measures the vehicle information including at least the number of passing vehicles and the vehicle speed, and the measurement unit measures the vehicle. Since a traffic judgment unit is provided to judge and notify the vehicle traffic condition in the tunnel based on the vehicle information provided, fire extinguishing plug devices are installed in the tunnel at intervals of, for example, 50 meters, and the arrangement intervals of the fire extinguishing plug devices are provided. It is possible to measure the number of vehicles and the vehicle speed with high accuracy such as 50 m intervals, and by significantly improving the measurement accuracy of vehicle information, it is possible to grasp the vehicle traffic condition in the tunnel including the traffic condition with high accuracy. And.

In addition, it is not necessary to embed the vehicle sensor in the road in the tunnel unlike the conventional traffic counter, and it can be easily installed by using the empty space in front of the housing of the fire hydrant device, and the housing of the fire hydrant device. The width of is also suitable as the placement interval of a pair of vehicle sensors, it is not necessary to secure an installation place or installation space dedicated to the vehicle sensors in the tunnel, and there is no need for a sensor housing, so installation is easy and costly. Is also cheap and feasible. This point also applies when the vehicle speed sensor is installed in a device other than the fire hydrant device such as a lighting device, a fire extinguisher box, and a tunnel fire detector installed at predetermined intervals in the tunnel.

(Effect of measurement by a pair of vehicle sensors installed in the fire hydrant device)
Further, a pair of vehicle sensors are arranged in the vicinity of the left and right sides in the longitudinal direction of the tunnel of the fire extinguishing plug device, and the measuring unit obtains vehicle information of the passing vehicle based on the detection signals of the pair of vehicle sensors arranged for each fire extinguishing plug device. Since the measurement was made, the housing of the fire extinguisher device has a width of about 1.8 meters in the longitudinal direction of the tunnel, and by arranging a pair of vehicle sensors on both the left and right sides of the housing, 1. It is possible to measure the number of vehicles and the vehicle speed passing through a section of about 8 meters with high accuracy. Further, since the installation interval of the pair of vehicle sensors is shorter than the length of the vehicle, the length of the vehicle can be obtained from the detection signal of the pair of vehicle sensors and the measured vehicle speed.

(Measurement by a pair of vehicle sensors installed in the adjacent fire hydrant device)
Further, a vehicle sensor is arranged for each fire extinguishing plug device, and the measuring unit measures the vehicle information of the passing vehicle based on the detection signals of the pair of vehicle sensors arranged in the fire extinguishing plug devices adjacent to each other in the longitudinal direction of the tunnel. Therefore, it is possible to measure the number and speed of vehicles passing through the section of 50 meters, which is the arrangement interval of the fire extinguishing plug device, with high accuracy. The vehicle speed measured in this case is the average speed in the 50-meter section determined by the installation interval of the fire hydrant device.

(Vehicle sensor)
Further, as a vehicle sensor, a magnetic sensor, an ultrasonic sensor, or an infrared sensor is provided, and by installing any of them on the front surface of the housing of the fire extinguishing plug device toward the road, it is possible to reliably detect a passing vehicle.

(Effect of average vehicle speed distribution in the tunnel)
In addition, the traffic judgment unit obtains the average vehicle speed per unit time based on the vehicle speed of each installation location of the fire hydrant device, and notifies the distribution of the average vehicle speed in the tunnel. For example, the distribution of the average vehicle speed at intervals of 50 meters, which is determined by the installation interval of the fire hydrant device, can be displayed in real time, and by monitoring the distribution of this average vehicle speed in the tunnel, the traffic condition of the vehicle as a whole tunnel can be grasped with high accuracy. Make it possible.

For example, when the distribution of the average vehicle speed in the tunnel is distributed in the vicinity of, for example, 80 km / h, which is the speed limit, it can be determined that the vehicle is passing smoothly without causing congestion. When a special vehicle such as a large trailer is traveling at low speed in the tunnel, the position of the low-speed vehicle and the average vehicle speed behind it are, for example, around 60 km / h, which is on the tunnel exit side with the passage of time. It becomes possible to grasp the traffic condition of low-speed vehicles in the tunnel with high accuracy.

In addition, when traffic jams occur at a specific position in the tunnel, the average vehicle speed in and behind the traffic jam is reduced to 40 km / h or less, and this traffic jam distribution is on the tunnel exit side over time. It becomes possible to grasp the state of traffic congestion in the tunnel with high accuracy.

In addition, when the traffic congestion in the tunnel disappears, the time it takes for the average vehicle speed to recover to a higher average vehicle speed from the beginning, which was the average vehicle speed indicating congestion at 40 km / h or less, toward the rear. It will be a change, and it will be possible to grasp the state of congestion elimination in the tunnel with high accuracy.

Furthermore, if a vehicle accident occurs in a tunnel, or if a vehicle accident involving a fire occurs, the vehicle behind the accident location will stop and the average vehicle speed will be zero kilometers per hour, resulting in a vehicle accident. The state of the vehicle in the tunnel can be grasped with high accuracy.

(Effect of average vehicle speed when there are no passing vehicles)
In addition, if the vehicle does not pass within the unit time for which the average vehicle speed is calculated, the measuring unit maintains the average vehicle speed obtained within the unit time before that, so that an accident occurs in the tunnel and an accident occurs. The distribution of the average vehicle speed indicates a vehicle stop at zero kilometers per hour behind the accident location, and on the other hand, the accident occurs even when all the vehicles in front of the accident location go out of the tunnel and the average vehicle speed cannot be calculated. The average vehicle speed in front of the place maintains the average vehicle speed obtained at the end, and can be distinguished from the average vehicle speed distribution indicating a vehicle stop at zero kilometers per hour behind the place where the accident occurred.

(Effect of traffic jam monitoring in the tunnel)
In addition, the traffic judgment unit sets a predetermined threshold number of vehicles that causes congestion according to the total length of the tunnel, and the number of vehicles passing through the tunnel obtained from the vehicle information measured by the measurement unit is equal to or greater than the threshold number. In the event of a traffic jam, the number of vehicles passing through was calculated based on the vehicle sensor of the fire extinguisher closest to the tunnel entrance, and was calculated based on the vehicle sensor of the fire extinguisher closest to the tunnel exit. By subtracting the number of passing vehicles, the number of vehicles passing through the current tunnel can be obtained, and when this is equal to or more than a predetermined threshold number, it is possible to predict the occurrence of traffic congestion in the entire tunnel and notify the vehicle.

(Effect of traffic jam monitoring by dividing the tunnel into sections)
In addition, the traffic judgment unit divides the inside of the tunnel into multiple traffic jam monitoring sections that are multiples of the installation interval of the fire extinguishing plug device, and the threshold number of traffic jams in the predetermined section corresponding to the length of the traffic jam monitoring section. When the number of vehicles passing in the traffic jam monitoring section obtained from the vehicle information measured by the measuring unit exceeds the threshold number of the predetermined section, the traffic jam is expected to occur in the traffic jam monitoring section unit. For example, if the total length of the tunnel is 1000 meters, the inside of the tunnel is divided into a traffic jam monitoring section of 200 meters, and the traffic jam is congested. For each monitoring section, the number of passing vehicles obtained based on the vehicle sensor installed in the fire extinguishing plug device at the section entrance is subtracted from the number of passing vehicles obtained based on the vehicle sensor installed in the fire extinguishing plug device at the exit of the section. When the number of vehicles passing through is obtained and this is equal to or greater than the threshold number of the predetermined traffic jam monitoring section, it is possible to predict the occurrence of traffic jam in the section and notify it, and it is possible to grasp the traffic jam state in the tunnel with high accuracy. do.

(Effect of traffic congestion criteria)
The congestion threshold for determining the congestion in the entire tunnel or the congestion monitoring section in the tunnel is based on the predetermined congestion occurrence standard that congestion occurs when there are 25 or more vehicles in a section of 1 km. Since it was set, this congestion threshold is a value obtained from the simulation of the traffic flow model by the cell automaton method, and it is possible to accurately predict the congestion phenomenon that is difficult to predict with the approach starting from the conventional differential equation. And.

(Effect of vehicle stop monitoring)
In addition, since the traffic judgment unit determines and notifies the vehicle stop in the tunnel based on the vehicle information, the state of the vehicle stopped in the tunnel due to the occurrence of a vehicle accident accompanied by a fire is highly accurate. It will be possible to grasp the situation and take measures such as evacuation guidance and firefighting activities more appropriately.

(Effect of vehicle stop judgment)
In addition, the traffic judgment unit is a fire hydrant for monitoring stopped vehicles located at an installation interval that is the minimum common multiple of the predetermined vehicle stop interval expected when a vehicle passing through the tunnel stops and the installation interval of the fire hydrant device. The device is set so that the stopped vehicle in the tunnel is determined and notified based on the vehicle information corresponding to the fire hydrant device for monitoring the stopped vehicle. Therefore, for example, the expected stop vehicle interval when the vehicle stops. Is, for example, 15 meters, and the installation interval of the fire hydrant device is 50 meters, so the minimum common multiple of both is 150 meters, and the fire hydrant device with an interval of 150 meters is used for vehicle stop monitoring and the stopped vehicle is based on the vehicle sensor. Makes it possible to accurately grasp the existence of.

In this case, the traffic judgment unit determines that the vehicle is stopped when the vehicle detection signal is continuously output for more than a predetermined time from the vehicle sensor provided in the fire hydrant device for monitoring the stopped vehicle, so that the fire hydrant device is used. It makes it possible to grasp the vehicle stopped in front of the vehicle with high accuracy.

(Effects of vehicle length measurement and number of vehicles passing by vehicle type)
In addition, the measuring unit measures the vehicle length of the passing vehicle from the detection signal of the vehicle sensor, and the traffic judgment unit classifies and classifies the size of the passing vehicle into a plurality of types based on the vehicle length measured by the measuring unit. Since the number of vehicles passing through is calculated for each type of vehicle and notified, the number of vehicles passing through the tunnel is divided into, for example, large vehicles, medium-sized vehicles, and small vehicles by using the vehicle sensor provided in the fire extinguisher device. It can be measured and enables a more detailed analysis of the traffic volume in the tunnel.

Explanatory drawing showing tunnel emergency equipment including fire hydrant device installed in the tunnel Explanatory drawing showing the fire hydrant device provided with the vehicle sensor from the front About FIG. 2 An explanatory view showing the internal structure of the main body with the fire hydrant door removed. Explanatory drawing showing the outline of emergency equipment for tunnels equipped with a fire hydrant device that monitors and controls with a disaster prevention receiver. Block diagram showing the functional configuration of the disaster prevention receiver and fire hydrant control device in FIG. Time chart showing the detection signal of the vehicle sensor Explanatory diagram showing the average vehicle speed distribution in the tunnel under normal driving conditions and low-speed vehicle driving conditions Explanatory diagram showing the average vehicle speed distribution in the tunnel when traffic jams occur and when the vehicle is stopped.

[Overview of emergency tunnel equipment]
FIG. 1 is an explanatory diagram showing a tunnel emergency facility including a fire extinguishing plug device installed in a tunnel of a motorway. As shown in FIG. 1, the inside of the tunnel 100 is covered with a semi-cylindrical tunnel wall surface 102, and a road 104 is provided at the bottom. In this example, the road 104 has two lanes in one direction.

An observer passage 106 is provided along the tunnel wall surface 102 on the left side of the road 104, and the internal space below the observer passage 106 is used as a duct, and a conduit and a water supply main 108 are laid.

Fire hydrant devices 10 are installed every 50 meters in the longitudinal direction of the tunnel 100. The fire hydrant device 10 houses a hose with a nozzle, and in the event of a fire, the fire hydrant door is opened and the hose with a nozzle is pulled out to enable fire extinguishing work.

Vehicle sensors 60 and 62 are installed on both sides of the upper front surface of the fire hydrant device 10 to detect a vehicle passing in the front lane on the road 104 in front of the fire hydrant device 10. In the tunnel 100, the front side is the entrance side and the front side is the exit side, and the vehicle sensors 60 and 62 are installed in the order of the vehicle sensor 60 and the vehicle sensor 62 with respect to the signal direction of the vehicle passing through the road 104.

[Overview of fire hydrant device]
FIG. 2 is an explanatory view showing the fire hydrant device provided with the vehicle sensor from the front, and FIG. 3 is an explanatory view showing the internal structure of the main body of FIG. 2 with the fire hydrant door removed.

(Outline of external structure)
As shown in FIG. 2, the fire hydrant device 10 has a structure divided into a housing 12 on the fire hydrant side and a fire extinguisher side, and decorative plates 14a and 14b divided on the front surface are mounted on the front surface, respectively, and are required for the housing 12. After the various equipment and members are assembled, they are connected and fixed, and in this state, they are carried into the tunnel site and installed on the gantry 11.

The door opening 16 of the decorative plate 14a on the right side is divided into upper and lower parts, a fire hydrant door 18 is arranged in the lower door opening, and a maintenance door 22 is arranged in the upper door opening.

The fire hydrant door 18 is provided so as to be openable and closable downward with a hinge on the lower side as the center, and is closed at a closed position by a door lock mechanism. The fire hydrant door 18 can be opened forward by pulling the handle 20 toward you to unlock the door lock mechanism.

The maintenance door 22 provided on the fire hydrant door 18 is closed at the closed position by the door lock mechanism, and by opening the fire hydrant door 18 and unlocking the inner lock at the time of inspection, the maintenance door 22 can be opened upward centering on the upper hinge. Can be done.

A notification device door 24 is provided on the left side of the door opening 16, a red indicator lamp 26, a transmitter 28 and a response lamp 30 functioning as a manual notification device are provided, and a telephone is provided inside the notification device door 24. A jack is provided.

The red indicator lamp 26 is constantly lit so that the installation location of the fire hydrant device 10 can be seen from a distance. In the event of a fire, when the transmitter 28 is pressed and the push button switch is turned on, a fire alarm signal is sent to the disaster prevention receiver board of the monitoring center to issue a fire alarm, and a response signal is sent from the disaster prevention receiver board to respond. The lamp 30 is turned on and the red indicator lamp 26 is blinked.

An openable fire extinguisher door 32 is provided on the left side of the notification device door 24, and for example, two fire extinguishers are stored. The fire extinguisher door 32 is provided with a handle 34, and when the handle 34 is pulled toward the fire extinguisher door 32, the latch is released and the fire extinguisher door 32 can be opened to the left side. Further, a viewing window 35 is provided under the fire extinguisher door 32 so that the presence or absence of the stored state of the fire extinguisher can be confirmed from the outside.

Vehicle sensors 60 and 62 are installed in the fire hydrant device 10. The vehicle sensors 60 and 62 are fixedly installed on the upper left and right decorative plates 14a that do not interfere with the opening and closing of the maintenance door 22.

The decorative plate 14a on the fire hydrant side of the fire hydrant device 10 has a width of, for example, about 1.1 meters, and the installation intervals of the vehicle sensors 60 and 62 are set to about 1.0 meters. The vehicle sensors 60 and 62 first detect a passing vehicle for a vehicle passing through the road (front lane) in front of the fire hydrant device 10, and then the vehicle sensor 62 detects the same passing vehicle.

The vehicle sensor 60 may be installed on the portion of the decorative plate 14b at the upper left end that does not interfere with the opening and closing of the fire extinguisher door 32.

(Outline of internal structure)
As shown in FIG. 3, a hose storage space 36 is formed substantially in the center of the housing 12, and a valve storage space 38 is formed on the right side thereof.

The hose storage space 36 is provided with a hose bucket 40 configured by a frame pipe. A plurality of frame pipes are arranged vertically and horizontally in the hose bucket 40, and a rectangular hose outlet 42 is formed as a partition on the lower center side.

The hose 44 is internally wound and stored in the hose bucket 40 and the hose storage space 36 surrounded by the inner wall of the housing. Here, the hose 44 is wound around the hose storage space 36 so as to be right-handed when viewed from the door opening 16.

A nozzle 46 is attached to the tip of the hose 44, and the nozzle 46 is composed of a water discharge portion and a handle, and is detachably held by a nozzle holder 48 provided at the right end of the hose bucket 40.

The valve storage space 38 formed on the right side of the hose storage space 36 is provided with a water supply valve 50 and a fire hydrant valve opening / closing lever 54a in the piping system from the fire hydrant connection port 52 to the hose 44 to which the piping from the pump equipment is connected. A fire hydrant valve, an automatic pressure regulating valve, an automatic drain valve, and a maintenance device 58 are provided.

In addition to maintenance and inspection, the maintenance door 22 is opened by the fire brigade in the event of a fire, and by exposing the water supply valve 50 and the pump start switch 96, the fire hose is connected to the water faucet to open the water supply valve 50 and the pump start switch 96. By operating, the fire extinguishing pump equipment is remotely activated to supply fire extinguishing water.

[Overview of emergency tunnel equipment]
FIG. 4 is an explanatory diagram showing an outline of emergency equipment for a tunnel equipped with a fire hydrant device that monitors and controls by a disaster prevention receiver.

As shown in FIG. 4, inside the tunnel 100, fire hydrant devices 10 provided with vehicle sensors 60 and 62 are installed at intervals of 50 meters in the longitudinal direction of the tunnel.

Further, in the tunnel 100, as emergency equipment other than the fire hydrant device 10, fire detectors are provided at predetermined intervals to detect a flame caused by a fire, and a manual notification device and an emergency telephone are provided for fire notification. Further, in order to protect the inside of the tunnel frame and the duct from a fire, a water spray for sprinkling fire extinguishing water from the water spray head is installed, but the illustration is omitted.

A disaster prevention receiving board 70 is installed in the monitoring center or the like, and a transmission line 72 is pulled out from the disaster prevention receiving board 70 to the tunnel 100, and a fire hydrant device 10 installed in the tunnel 100 is connected to the tunnel 100. An optical fiber transmission line such as FTTH or a coaxial transmission line is used as the transmission line 72, and digital transmission using, for example, an IP packet or the like is performed.

For the disaster prevention receiver 70, fire extinguishing pump equipment 74, cooling pump equipment 76 for ducts, ventilation equipment 78, alarm display board equipment 80, radio rebroadcasting equipment 82, TV monitoring equipment 84, lighting equipment 86 and IG. The slave station equipment 88 and the like are provided, and the other equipment is individually connected to the disaster prevention receiver 70 by a P-type signal line, except that the IG slave station equipment 88 is connected by a data transmission line.

Here, the ventilation equipment 78 is equipment that gives energy to the air in the tunnel by the high blowing wind speed due to the operation of the jet fan installed on the ceiling side in the tunnel to cause a ventilation flow in the longitudinal direction of the tunnel.

The alarm display board equipment 80 is equipment that displays an abnormality in the tunnel on an electric display board to notify the user in the tunnel. The radio rebroadcasting facility 82 is a facility for allowing a driver or the like to receive information from a road administrator in a tunnel. The TV monitoring equipment 84 is a facility for confirming the scale and position of a fire, operating a water spraying facility, and grasping the situation in a tunnel when evacuation guidance is performed.

The lighting equipment 86 is equipment that drives and manages the lighting equipment in the tunnel. Further, the IG slave station equipment 88 is a communication equipment that connects the disaster prevention receiving panel 70 and the remote monitoring and control equipment 90, which is a higher-level equipment provided outside, via the network 92.

[Tunnel traffic flow monitoring system]
FIG. 5 is a block diagram showing the functional configuration of the disaster prevention receiving panel and the fire hydrant control device of FIG. 2, and has a function as a tunnel traffic flow monitoring system.

(Control mechanism of fire hydrant device)
As shown in FIG. 5, the fire hydrant device 10 is provided with a fire hydrant control unit 126 and a transmission unit 128. The transmission unit 128 transmits / receives IP packets to / from the disaster prevention receiver board 70. Therefore, a unique IP address is set in the transmission unit 128.

The fire hydrant control unit 126 is a function realized by executing a program, for example, and uses a CPU, a memory, a computer circuit provided with various input / output ports and the like as hardware.

A vehicle sensor 60, 62, a red indicator lamp 26, a transmitter 28, a response lamp 30, a fire hydrant open detection switch 94, and a pump start switch 96 are connected to the fire hydrant control unit 126.

When the fire hydrant control unit 126 inputs a signal operated by the transmitter 28, the fire hydrant control unit 126 controls the transmission unit 128 to transmit a fire notification signal to the disaster prevention receiving panel 70.

Further, since the disaster prevention receiving panel 70 that has received the fire notification signal from the fire hydrant device 10 outputs a fire alarm and transmits a response confirmation signal, the fire hydrant control unit 126 outputs the confirmation response signal from the disaster prevention receiving panel 70. After receiving the signal, the response lamp 30 is turned on, and the red indicator lamp 26 is controlled to blink.

Further, when the fire hydrant control unit 126 inputs a signal by turning on the fire hydrant open detection switch 94 or turning on the pump start switch 96, the fire hydrant control unit 126 instructs the transmission unit 128 to transmit the pump start signal to the disaster prevention receiving panel 70, and FIG. The fire extinguishing pump equipment 74 shown in the above is controlled to be started.

(Vehicle sensor)
As the vehicle sensors 60 and 62 installed in the fire hydrant device 10, a magnetic sensor, an ultrasonic sensor, or an infrared sensor can be used. The magnetic sensor detects magnetic changes as the vehicle passes by. An ultrasonic sensor transmits an ultrasonic wave from an ultrasonic transmitter toward a road, and receives a reflected wave accompanying the passage of the vehicle with an ultrasonic receiver to detect the vehicle. The infrared sensor irradiates infrared rays from a light emitter toward the road, and receives the reflected wave accompanying the passage of the vehicle with a light receiver to detect the vehicle.

6A and 6B are time charts showing the detection signals of the vehicle sensor, FIG. 6A shows the detection signal of the vehicle sensor 60, and FIG. 6B shows the detection signal of the vehicle sensor 62.

When the vehicle passes the road in front of the fire hydrant device 10, the detection signal from the vehicle sensor 60 rises to the H level at time t1, maintains the H level while the vehicle is passing, and falls at the time t3.

Further, when the detection signal of the vehicle sensor 60 rises to the H level at time t1, the detection signal of the vehicle sensor 62 rises to the H level at the subsequent time t2, maintains the H level while the vehicle is passing, and the time. It goes down at t4.

Based on the detection signals of the vehicle sensors 60 and 60, the number N of passing vehicles, the vehicle speed V, and the vehicle length VL can be measured. The number N of passing vehicles may be counted by a counter, for example, by generating a pulse synchronized with the rising edge of the detection signal of the vehicle sensor 60.

The vehicle speed V is calculated by the following equation from the time difference ΔT1 of the rise times tt and t2 of the vehicle sensors 60 and 62, where L is the installation interval of the vehicle sensors 60 and 62.
V = L / ΔT1 = L / (t1-t2) (Equation 1)
The vehicle length VL is calculated by the following equation from the vehicle speed V and the time difference ΔT2 from the rise time t1 to the fall time t3 of the vehicle sensor 60, for example.
VL = V · ΔT2 = V (t1-t3) (Equation 2)
The vehicle length VL may be similarly obtained from the vehicle sensor 62, and the accuracy may be improved by calculating the average value with the vehicle length obtained from the vehicle sensor 60.

(Measurement of vehicle information)
Referring to FIG. 5 again, the fire hydrant control unit 126 is provided with the function of the measurement unit 130. The measuring unit 130 measures the number of vehicles, the vehicle speed, and the vehicle length of the vehicle passing through the installation location of the fire hydrant device 10 based on the detection signals of the vehicle sensors 60 and 62. In the measurement of the number of units by the measuring unit 130, for example, a pulse synchronized with the rising edge of the detection signal of the vehicle sensor 60 shown in FIG. 6 is generated and counted by the counter. Further, the measurement of the vehicle speed and the vehicle length by the measuring unit 130 is based on the above (Equation 1) and (Equation 2).

Further, the measuring unit 130 calculates the average vehicle speed Va based on the vehicle speed measured within this cycle for each cycle that becomes a predetermined unit time, for example, every one minute cycle. Further, when the vehicle does not pass in front of the fire hydrant device 10 during a predetermined cycle, the measuring unit 130 holds the average vehicle speed calculated in the previous cycle. As a result, even if the vehicle is not passing through the tunnel, the average vehicle speed calculated for the cycle in which the vehicle has passed will continue to be updated until a new vehicle is added.

Further, the measuring unit 130 discriminates a small car, a medium-sized car, and a large car from the measured vehicle length, and measures the number of each.

The vehicle information including the vehicle speed, the average vehicle speed, the number of vehicles, and the vehicle length measured by the measuring unit 130 is obtained when the transmission unit 128 receives a call signal including a poll command specifying its own IP address from the disaster prevention receiving panel 70. Vehicle information is set in the call answer signal and transmitted to the disaster prevention receiving panel 70.

(Functional configuration of disaster prevention receiver)
As shown in FIG. 5, the disaster prevention receiving panel 70 includes a panel control unit 110, and the panel control unit 110 is a function realized by executing a program, for example, and the hardware includes a CPU, a memory, various input / output ports, and the like. Use a computer circuit or the like equipped with.

A transmission unit 112 is provided for the panel control unit 110, and a fire hydrant device 10 installed at intervals of 50 meters in the tunnel 100 is connected to a transmission line 72 drawn from the transmission unit 112.

The panel control unit 110 communicates with an alarm unit 114 equipped with a speaker, an alarm indicator light, etc., a display unit 116 equipped with a liquid crystal display, a printer, etc., an operation unit 118 equipped with various switches, etc., and external monitoring equipment. A modem 120 for connecting the IG slave station equipment 88 is provided, and further, the fire extinguishing pump equipment 74, the cooling pump equipment 76, the ventilation equipment 78, the alarm display board equipment 80, the radio rebroadcasting equipment 82, and the television monitoring equipment shown in FIG. 4 are provided. An IO unit 122 to which the 84 and the lighting equipment 86 are connected is provided.

The panel control unit 110 repeatedly transmits a call signal including a polling command instructing the transmission unit 112 to sequentially specify the addresses of the fire detectors installed in the tunnel, and the fire detectors match their own addresses. When it receives the call signal, it returns a response signal including its own status information such as fire detection.

(Judgment of tunnel traffic status)
The panel control unit 110 is provided with the function of the traffic determination unit 124. When the traffic determination unit 124 receives a response signal including vehicle information measured by the measurement unit 130 of the fire hydrant device 10 in response to the transmission of the call signal to the fire hydrant device 10, the vehicle traffic in the tunnel is based on the received vehicle information. Controls to determine the status and notify it.

The traffic determination unit 124 notifies the vehicle traffic status in the tunnel in various forms such as a display by a liquid crystal display provided on the display unit 116, a print output by a printer, an alarm output by the alarm unit 114, and a transfer output to an external facility. Is included.

(Average vehicle speed distribution in the tunnel)
The traffic determination unit 124 generates a distribution of the average vehicle speed in the tunnel based on the average vehicle speed per unit time calculated by the measurement unit 130 of the fire hydrant device 10, and is installed in, for example, the display of the display unit 116 or the monitoring center. Control is performed to display the average vehicle speed distribution in the tunnel as a graph on the monitoring display.

FIG. 7 is an explanatory diagram showing the average vehicle speed distribution in the tunnel in the normal driving state and the low-speed vehicle driving state, and FIG. 8 is an explanatory diagram showing the average vehicle speed distribution in the tunnel in the traffic jam occurrence state and the vehicle stop state. Taking the case where the length is 1 kilometer (1000 meters) as an example, since the fire extinguishing plug devices 10 are installed at intervals of 50 meters, the intervals of 50 meters are based on the detection signals of the vehicle sensors 60 and 62 provided respectively. The average vehicle speed is obtained in, and is displayed as a distribution of a bar graph showing the speed, for example.

In FIG. 7A, the average vehicle speed is distributed in the vicinity of, for example, 80 km / h, which is the speed limit, and the average vehicle speed distribution allows vehicles to pass smoothly in the tunnel without causing congestion. It can be judged that it has been damaged.

In FIG. 7B, the average vehicle speed drops to around 60 km / h near 500 meters from the tunnel entrance, and the average vehicle speed distribution close to this drops to the low speed distribution 140 that continues to the tunnel entrance side, while 500 meters ahead. Has an average vehicle speed distribution exceeding 80 km / h, and this average vehicle speed distribution changes as it moves toward the tunnel exit side with the passage of time.

In the average speed distribution in which the low speed distribution 140 shown in FIG. 7B appears, it is assumed that a special vehicle such as a large trailer is traveling at a low speed in the tunnel. In such a case, for example, by the operation of the management person, an alarm display such as "during low-speed vehicle running" is displayed on the electric display board of the warning display board equipment 80 to notify the user of the passage state.

In FIG. 8A, the average vehicle speed drops to around 40 km / h near 500 meters from the tunnel entrance, and the average vehicle speed distribution further lower than 40 km / h continues from this side to the tunnel entrance side. Here, since the congestion phenomenon on the expressway is defined as "a state in which the extension of a 1-kilometer convoy continues for 15 minutes or more at a speed of 40 km / h or less", the state on the tunnel entrance side is a congestion distribution of 150. It is expected that. On the other hand, from 500 meters onward, the average vehicle speed is distributed over 40 kilometers per hour.

When the traffic jam distribution 150 is confirmed in this way, for example, by the operation of the management person, an alarm display such as "traffic jam" is displayed on the electric display board of the warning display board equipment 80 to notify the user of the traffic condition. become.

Here, when the congestion distribution 150 shown in FIG. 8A moves toward the tunnel exit side with the passage of time, it indicates that the congestion is progressing in the tunnel. On the other hand, when the congestion distribution 150 shown in FIG. 8A moves toward the tunnel entrance side with the passage of time, it indicates a state in which the congestion in the tunnel is eliminated.

FIG. 8B shows a vehicle stop distribution 160 in which the average speed distribution from the tunnel entrance to the tunnel entrance is around zero km / h, while the average speed from 650 m to the tunnel exceeds 80 km / h. It is a distribution of vehicle speed. This average vehicle speed distribution represents a state in which a vehicle accident or vehicle failure occurs in the vicinity of 650 meters from the tunnel entrance and the following vehicle is stopped.

When the vehicle stop distribution 160 is confirmed in this way, for example, an alarm display such as "an accident occurred near 650 meters from the entrance" is displayed on the electric display board of the warning display board equipment 80 by the operation of the management person. Will inform the person.

In addition, the distribution of the average vehicle speed beyond the accident location of 650 meters is such that even if the vehicle ahead of the accident location leaves the tunnel and there are no passing vehicles, the average vehicle speed cannot be obtained in real time. The distribution of the average vehicle speed obtained before that is displayed.

In this way, according to the traffic determination unit 124, the distribution of the average vehicle speed at intervals of, for example, 50 meters, which is determined by the installation interval of the fire hydrant device 10 based on the average vehicle speed obtained for each fire hydrant device 10, is displayed in real time at a monitoring center or the like. By monitoring the distribution of the average vehicle speed in the tunnel, the observer can grasp the traffic condition of the vehicle as a whole tunnel with high accuracy.

(Traffic congestion monitoring in the tunnel)
Further, the traffic determination unit 124 provided on the disaster prevention receiving panel 70 sets a predetermined threshold value Nth corresponding to the total length of the tunnel and obtains it from the vehicle information measured by the measurement unit 130 of the fire hydrant device 10. When the number of vehicles passing through the tunnel exceeds the threshold number Nth, control is performed to predict the occurrence of traffic congestion and notify the user.

Here, the traffic determination unit 124 measures the number of vehicles ΔN passing through the tunnel from the number of vehicles Nin measured by the measurement unit 130 of the fire extinguisher device 10 closest to the tunnel entrance to the fire extinguisher device closest to the tunnel exit. It is obtained by subtracting the number of vehicles Tunnel measured by the measuring unit 130 of 10.
ΔN = Nin-Nout (Equation 3)
In addition, the traffic judgment unit 124 determines that the threshold number Nth for predicting the occurrence of traffic congestion is "a traffic jam occurs when there are 25 or more vehicles in a section of 1 km" predicted by the cellular automaton method. It is set based on the predetermined congestion occurrence standard that says "to do".

For example, when the tunnel length is 1 km, the threshold number Nth for traffic congestion prediction is Nth = 25, and when the tunnel length is 2 km, Nth = 50. Further, at 500 meters, Nth = 12.5 units, but it is converted into an integer and Nth = 13 units. Furthermore, at 200 meters, Nth = 5 units.

The threshold number of such congestion prediction is a value obtained from the simulation of the traffic flow model by the cellular automaton method, and it is necessary to accurately predict the congestion phenomenon that is difficult to predict by the conventional approach using the differential equation as a starting point. Make it possible.

(Congestion monitoring in which the tunnel is divided into sections)
Further, the traffic determination unit 124 divides the inside of the tunnel into a plurality of traffic jam monitoring sections having a length of a multiple K of the installation interval of the fire extinguishing plug device 10, and determines that traffic jams occur corresponding to the length KL of the traffic jam monitoring section. When the number of vehicles passing through the traffic jam monitoring section is equal to or greater than the section threshold number KNth, the traffic jam is predicted to occur in the traffic jam monitoring section unit. Control to notify.

Here, the traffic determination unit 124 determines the number of vehicles ΔKN passing through the traffic jam monitoring section from the number of vehicles KNin measured by the measurement unit 130 of the fire hydrant device 10 at the section entrance to the fire hydrant device 10 at the section exit. It is obtained by subtracting the number of vehicles KNout measured by the measuring unit 130.
ΔKN = KNin-KNout (Equation 4)
For example, if the tunnel length determined by the distance from the fire hydrant device 10 on the tunnel entrance side to the fire hydrant device 10 on the tunnel exit side is 1 kilometer, this is divided into five congestion monitoring sections in units of 200 meters. According to the cellular automaton method, the number of compartment thresholds KNth for traffic congestion prediction in this case is KNth = 5.

Therefore, when the traffic determination unit 124 calculates the number of vehicles ΔKN in the section from the above (Equation 4) for each congestion monitoring section and determines that the section threshold number KNth = 5 or more in the congestion prediction, the section is congested. Predict and notify the occurrence.

This makes it possible to monitor the congestion state by dividing the tunnel into a plurality of sections, and in particular, it is possible to grasp the congestion state in a long tunnel exceeding several kilometers with high accuracy.

(Vehicle stop monitoring)
Further, the traffic determination unit 124 controls to determine and notify the stop of the vehicle in the tunnel based on the vehicle information measured by the measurement unit 130 from the detection signals of the vehicle sensors 60 and 62 provided in the fire hydrant device 10. conduct.

Here, it is known that the inter-vehicle stop interval when the vehicle is traveling in the tunnel is about 40 meters, while the inter-vehicle stop interval when the vehicle is stopped in the tunnel is about 15 meters.

Therefore, the traffic determination unit 124 has a least common multiple of a predetermined vehicle stop interval expected when a vehicle passing through the tunnel stops, for example, 15 meters, and an installation interval of the fire hydrant device 10, for example, 50 meters. Fire hydrant devices 10 arranged at intervals of installation, for example, at intervals of 150 meters, are set for monitoring stopped vehicles, and based on vehicle information corresponding to the fire hydrant device 10 for monitoring stopped vehicles, stopped vehicles in the tunnel are determined and notified. Control to make it.

In this case, the traffic determination unit 124 determines that the vehicle has stopped when the detection signal is continuously output from the vehicle sensors 60 and 62 provided in the fire hydrant device 10 for monitoring the stopped vehicle for more than a predetermined time. Control to notify. For this reason, it is possible to grasp the state of the vehicle stopped in the tunnel with high accuracy due to the occurrence of a vehicle accident or a vehicle accident accompanied by a fire, and it is possible to take measures such as evacuation guidance and firefighting activities more appropriately. do.

In addition, it is assumed that the detection signal is continuously output due to the failure of the vehicle sensor, but in this case, only the fire hydrant determination unit of the fire hydrant device in which the failed vehicle sensor is arranged determines that the vehicle is stopped. , Other than that, the fire hydrant judgment unit of the fire hydrant device in which the vehicle sensor is operating normally does not judge the vehicle stop, so the traffic judgment unit provided in the disaster prevention receiving panel of the monitoring center judges the vehicle stop. It is not determined that the vehicle sensor provided in the fire hydrant device has failed, and the vehicle stop in the tunnel is not erroneously notified.

In addition, when a fire extinguishing plug device is installed facing the vehicle stop zone provided in the tunnel, a detection signal is continuously output from the vehicle sensor when a resting vehicle or a broken vehicle stops in the vehicle stop zone. Since a case is assumed, it is necessary to install the vehicle sensor provided in the fire extinguishing plug device located in the vehicle stop zone so that the vehicle stop zone does not enter the detection area.

[Modified example of the present invention]
(Installation interval of fire hydrant device)
In the above embodiment, vehicle sensors are provided in all of the fire hydrant devices 10 arranged at intervals of 50 meters in the tunnel to measure vehicle information, but the present invention is not limited to this. For example, a vehicle sensor may be provided to determine a fire hydrant device for measuring vehicle information, such as 100-meter intervals, 150-meter intervals, 200-meter intervals, and the like.

Further, in the above embodiment, a pair of vehicle sensors are installed for each fire hydrant device, but the present embodiment is not limited to this. For example, one vehicle sensor may be provided for each fire hydrant device, and the number, vehicle speed, and vehicle length may be measured based on a pair of vehicle sensors provided in the adjacent fire hydrant devices.

(Display of velocity distribution)
In the above embodiment, the average vehicle speed is obtained for each fire hydrant device, and the average vehicle speed distribution in the tunnel is displayed so that the vehicle traffic state can be determined, but the present invention is not limited to this. For example, when a speed limit for determining overspeed, for example, 120 km / h is set and a vehicle speed exceeding the speed limit is measured, the graph display of the average speed distribution shown in FIGS. 7 and 8 is used. , The overspeed bar graph is displayed in units of fire extinguishing plugs, and this overspeed bar graph is displayed as moving in the tunnel over time, so that vehicles traveling at overspeed in the tunnel can be tracked and displayed. May be.

(Monitoring multiple lanes)
Further, in the above embodiment, of the two lanes in the tunnel, the vehicle traveling in the lane in front of the fire hydrant device is detected by the vehicle sensor and the vehicle information is measured, but the present invention is not limited to this. For example, a pair of vehicle sensors with the outer lane as the detection area is separately provided at a high position of the tunnel wall where the fire extinguishing plug device is installed or on the opposite tunnel wall, and vehicle information is measured for each of the two lanes. The traffic condition may be determined and notified.

(Installation location of vehicle sensor)
In the above embodiment, the vehicle sensor is installed in the fire hydrant device, but the present invention is not limited to this. For example, since the lighting device is installed in the tunnel, the vehicle sensor may be installed for each lighting device at a predetermined interval.

In addition, the vehicle speed sensor may be installed in a fire extinguisher box, tunnel fire detector, automatic valve device, water spray equipment, etc. installed in the tunnel, and vehicle speed sensors of different devices may be installed and combined. Is also good.

(others)
Further, the present invention includes appropriate modifications that do not impair its purpose and advantages, and is not further limited by the numerical values shown in the above embodiments.

10: Fire hydrant device 12: Housing 14a, 14b: Decorative plate 16, 17: Door opening 18: Fire hydrant door 36: Hose storage space 38: Valve storage space 40: Hose bucket 42: Hose outlet 44: Hose
46 : Nozzle 50: Water supply valve 58: Maintenance device 60, 62: Vehicle sensor 70: Disaster prevention receiver 72: Transmission line 100: Tunnel 102: Tunnel wall surface
104: Road
106: Observer passage 108: Water supply main 110: Panel control unit 112, 128: Transmission unit 124: Traffic judgment unit 128: Fire hydrant control unit 130: Measurement unit

Claims (15)

A plurality of fire hydrant apparatus installed at predetermined intervals in the tunnel longitudinal direction,
A vehicle sensor that is arranged for each of the plurality of fire hydrant devices and detects a vehicle passing in front of the fire hydrant device.
A measuring unit that measures vehicle information including at least the number of passing vehicles and vehicle speed based on the detection signals of the pair of vehicle sensors arranged in the longitudinal direction of the tunnel.
A traffic judgment unit that determines and notifies the vehicle traffic condition in the tunnel based on the vehicle information measured by the measurement unit.
Equipped with
The measuring unit obtains an average vehicle speed per unit time based on the vehicle speed of each installation location of the fire hydrant device, and if the vehicle does not pass within the unit time for obtaining the average vehicle speed, the measurement unit within the previous unit time. A traffic flow monitoring system in a tunnel characterized by maintaining the average vehicle speed obtained in.
Multiple fire hydrant devices installed at predetermined intervals in the longitudinal direction of the tunnel,
A vehicle sensor that is arranged for each of the plurality of fire hydrant devices and detects a vehicle passing in front of the fire hydrant device.
A measuring unit that measures vehicle information including at least the number of passing vehicles and vehicle speed based on the detection signals of the pair of vehicle sensors arranged in the longitudinal direction of the tunnel.
A traffic judgment unit that determines and notifies the vehicle traffic condition in the tunnel based on the vehicle information measured by the measurement unit.
Equipped with
The traffic determination unit is a fire extinguisher for monitoring stopped vehicles located at an installation interval that is the least common multiple of the predetermined vehicle stop interval expected when a vehicle passing through the tunnel stops and the installation interval of the fire extinguishing plug device. A traffic flow monitoring system in a tunnel, characterized in that a device is set and a stopped vehicle in the tunnel is determined and notified based on vehicle information corresponding to the fire extinguishing plug device for monitoring the stopped vehicle.
In the in-tunnel traffic flow monitoring system according to claim 1 or 2.
A pair of vehicle sensors are arranged in the vicinity of the left and right sides of the fire hydrant device in the longitudinal direction of the tunnel.
The measuring unit is a traffic flow monitoring system in a tunnel, which measures vehicle information of a passing vehicle based on detection signals of a pair of vehicle sensors arranged for each fire hydrant device.
In the in-tunnel traffic flow monitoring system according to claim 1 or 2.
The vehicle sensor is disposed in each of the fire hydrant apparatus,
The measuring unit is a traffic flow monitoring system in a tunnel, which measures vehicle information of a passing vehicle based on detection signals of a pair of vehicle sensors arranged in the fire hydrant device adjacent to the tunnel longitudinal direction. ..
In the in-tunnel traffic flow monitoring system according to claim 1 or 2.
The vehicle sensor, tunnels traffic flow monitoring system, wherein the magnetic sensor, an ultrasonic sensor or an infrared sensor.
In the tunnel traffic flow monitoring system according to claim 1,
The traffic determination unit is a traffic flow monitoring system in a tunnel, characterized in that the distribution of the average vehicle speed in the tunnel is notified based on the average vehicle speed obtained by the measurement unit.
In the tunnel traffic flow monitoring system according to claim 2,
The measuring unit obtains an average vehicle speed per unit time based on the vehicle speed of each installation location of the fire hydrant device.
The traffic determination unit, based on the average vehicle speed obtained by the measuring section, tunnel traffic flow monitoring system characterized that you informing the distribution of the average vehicle speed in the tunnel.
In the in-tunnel traffic flow monitoring system according to claim 7.
The measuring unit is configured when there is no passage of vehicles within the unit time for determining the average vehicle speed, the tunnel in the traffic flow monitor system characterized that you hold the average vehicle speed obtained in the previous unit time.
In the traffic flow monitoring system in a tunnel according to claim 1 or 2 , the traffic determination unit sets a predetermined threshold number for which congestion occurs corresponding to the total length of the tunnel, and the vehicle measured by the measurement unit. tunnel traffic flow monitoring system when the number of vehicles that are passing through the tunnel becomes equal to or greater than the threshold value number, characterized that you notification in anticipation of traffic congestion determined from the information.
In the in-tunnel traffic flow monitoring system according to claim 1 or 2.
The traffic judgment unit
The inside of the tunnel is divided into a plurality of traffic jam monitoring sections having a length that is a multiple of the installation interval of the fire hydrant device, and the threshold number of the predetermined section in which the traffic jam occurs is set according to the length of the traffic jam monitoring section.
When the number of vehicles passing through the traffic jam monitoring section obtained from the vehicle information measured by the measuring unit exceeds the threshold number of the predetermined section, the occurrence of traffic jam is predicted and the traffic jam monitoring section unit. tunnel traffic flow monitoring system characterized that you notify the.
In the traffic flow monitoring system in a tunnel according to claim 9 or 10 , the threshold number is set to a predetermined congestion generation standard that congestion occurs when 25 or more vehicles are present in a section of 1 km. An intra-tunnel traffic flow monitoring system characterized by being set based on.
In the in-tunnel traffic flow monitoring system according to claim 1 or 2 , the traffic determination unit determines and notifies the stop of the vehicle in the tunnel based on the vehicle information measured by the measurement unit. A traffic flow monitoring system in a tunnel featuring.
In the traffic flow monitoring system in a tunnel according to claim 12 , the traffic determination unit has a predetermined vehicle stop interval expected when a vehicle passing through the tunnel stops and an installation interval of the fire hydrant device. set the fire hydrant apparatus for stopping a vehicle monitoring located at the installation intervals to be the least common multiple, based on the vehicle information corresponding to the fire hydrant apparatus for the stop vehicle monitoring, Rukoto be reported to determine the vehicle stops in the tunnel A traffic flow monitoring system in a tunnel featuring.
In the traffic flow monitoring system in a tunnel according to claim 2 or 13 , the traffic determination unit continuously sends a vehicle detection signal from the vehicle sensor provided in the fire hydrant device for monitoring a stopped vehicle for more than a predetermined time. A traffic flow monitoring system in a tunnel, which is characterized by determining that the vehicle is stopped when it is output to.
In the in-tunnel traffic flow monitoring system according to claim 1 or 2.
The measuring unit measures the length of the passing vehicle from the detection signal of the vehicle sensor, and measures the length of the passing vehicle.
The traffic determination unit is configured to classify the size of the passing vehicle based on the vehicle length measured by the measuring unit to the plurality of types, characterized that you notification seeking number pass for each type of classified vehicle Traffic flow monitoring system in the tunnel.

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