JPH09115092A - Traffic signal switching system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the signal operation of a one-side traffic regulation while watching conditions on a monitor screen by installing a camera at the entrance of a road construction zone. SOLUTION: Signals 4 and 5 are installed at both the ends of the road construction zone, the image of a camera 11 on the side of the signal 4 is SS modulated by an SS modulation/transmission part 12 and transmitted from an antenna 13 on weak radio waves, the image of a camera 21 on the side of the signal 5 is SS modulated by an SS modulation/transmission part 22 and transmitted from an antenna 23 on weak radio waves, the radio waves from the antennas 13 and 23 are received through an antenna 31 to a reception/SS demodulation part 32, SS-demodulated and displayed on a monitoring device 33, a signal switching instruction is inputted from an input part 34 while watching the screen, and the signals 4 and 5 are switched by a signal control part 36. When the instruction for switching the signal 4 from 'blue' to 'red' is inputted, the signal 4 is immediately switched to 'red', a timer 35 is simultaneously started, and the signal 5 can be also switched to 'blue' by counting time +αrequired for an automobile to pass through the construciton zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal system which is temporarily installed for traffic control in road construction and the like, and relates to a system which monitors the condition of the entrance of a construction section by an image of a television camera and switches signals.

[0002]

2. Description of the Related Art In order to restrict traffic to one side of an automobile during road construction, traffic lights are temporarily installed at both ends of the construction section, and for example, the traffic lights are switched between red and blue in units of required time.
Alternatively, there is a system in which supervisors are arranged at both ends of the construction section and switched according to the number of vehicles waiting. But,
In the former, there is a problem that many cars are waiting on the other side even though there is no waiting car on one side, and the latter solves such a problem, but in addition to the personnel who perform the signal switching operation, There is a problem in that a large number of personnel is required because a supervisor must be placed at both ends.

[0003]

In view of the above, the present invention has television cameras (hereinafter abbreviated as cameras) arranged at both ends of a road construction section and transmits a video signal to a signal control station by a weak radio wave. However, it is intended to monitor the standby status of the automobiles at both ends on the monitor screen so that signal switching can be efficiently performed with a minimum number of personnel.

[0004]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention installs traffic signals at both ends of a road construction section for traffic control on one side of a vehicle due to road construction, etc., and switches signals by required operation. In what you do, at the end of the road construction section, a camera that captures the outside direction of the road construction section,
A modulation / transmission unit that modulates the required high frequency signal with the video signal from the camera and transmits it with a weak radio wave is provided, and at the signal operation place,
A reception / demodulation unit that receives and demodulates radio waves from the modulation / transmission unit, a monitor device that displays based on a video signal from the reception / demodulation unit, an input unit that inputs switching of traffic signals, and an input unit And a signal control unit for switching the traffic signal based on the signal of the traffic signal, monitoring the situation of the vehicle entering the road construction section on the monitor screen of the signal control station, and switching the traffic signal A switching system is provided.

[0005]

With the above construction, in the traffic signal switching system according to the present invention, the cameras are arranged at both ends of the road construction section, and the required high frequency signal is spread spectrum (SS) modulated by the video signal from the camera. The signal is sent out as a weak radio wave, and this radio wave is received by the reception / demodulation unit installed at the signal control station, SS demodulated, and the demodulated video signal is input to the monitor device, and the monitor screen displays the automobile signal to the road construction section. The signal is switched while watching the approach waiting status.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a traffic signal switching system according to the present invention will be described below in detail with reference to the drawings. 1 is a schematic diagram of an embodiment of a traffic signal switching system according to the present invention, FIG.
Is a block diagram of a main part. In FIG. 1, 1 and 2 are monitoring terminals provided at both ends of the road construction section, 3 is a signal control station, and 4 and 5 are traffic signals installed at both ends of the road construction section. As shown in FIG. 2, the monitoring terminal 1 is a camera 1
1, the SS modulation / transmission unit 12 and the antenna 13, and the monitoring terminal 2 is also composed of the camera 21, the SS modulation / transmission unit 22 and the antenna 23, like the monitoring terminal 1, and the signal control station 3 is the antenna 31. , Reception / SS demodulation unit 32, monitor device 3
3, an input unit 34, a timer 35, and a signal control unit 36.

Next, the operation of the traffic signal switching system according to the present invention will be described. Traffic lights 4 and 5 for one-sided traffic control are installed at both ends of the road construction section, a camera 11 is installed near the traffic signal 4 toward the outside of the construction section, and the video signal from the camera 11 is SS-modulated and transmitted. The signal is SS-modulated by 12 and transmitted by the weak radio wave from the antenna 13. Also, a camera 21 is installed near the traffic signal 5 toward the outside of the construction section.
The image signal is modulated by the SS modulator / oscillator 22 and transmitted by the antenna 23 as a weak radio wave. Each of these SS modulation
The radio waves from the transmitters 12 and 22 are transmitted to the antenna of the signal control station 3.
Catch at 31 and, for example, alternately receive at the receiving / SS demodulation unit 32, input to the monitor device 33, and while watching the standby status of the cars at both ends of the construction section on the monitor screen, instruct the signal switching from the input unit 34 Is input to switch the traffic signals 4 and 5 appropriately.

The above is for switching between the traffic light 4 and the traffic light 5 while observing the condition of both ends of the construction section on the monitor screen. For example, after switching the traffic light 4 to "red", this signal is "red". The operation is to switch the other traffic light 5 to "blue" after observing that the car that has entered before passes through the construction area. Alternatively, the other traffic signal 5 may be switched to "blue" when the time required to pass through is passed.

That is, the "blue" traffic light 4 from the input unit 34
When an instruction to switch to "red" is input, the traffic light 4 is immediately switched to "red" by the signal control unit 36 based on the signal from the input unit 34, and the timer 35 is started at the same time. The timer 35 is a timer that measures the time required for the vehicle to pass through the road construction section + alpha. When the time-up signal from the timer 35 is reached, the “red” traffic light 5 is turned “blue” via the signal control unit 36. Switch to "". It should be noted that each part of the signal operation place 3 may be provided in the automobile, parked at an appropriate place on the road construction site, and the signal operation may be performed from the inside of the automobile. By installing the device in the car,
Since it is not necessary to arrange a guide member at the entrance of the construction section, for example, it is possible to maintain good working conditions even in bad weather conditions, and it is easy to speed up local response when road construction is performed at various places.

It should be noted that two sets of the receiving / SS demodulating section 32 and the monitor device 33 are provided to separately display the images of the respective cameras, or a screen synthesizing section is provided to display an image by the image signal from the receiving / SS demodulating section 32 It is also possible to arrange them side by side and combine them into one screen, and display the images of both ends of the construction section on the screen of one monitor device.

As described above, the noise resistance is improved by SS-modulating the image signal of the camera and transmitting it, so that the image is less likely to be disturbed by the ignition noise of the automobile and the power spectrum density is reduced. Since it is low, it can prevent interference with surrounding devices.

[0012]

As described above, according to the traffic signal switching system of the present invention, the signal switching operation is performed while observing the conditions at both ends of the road construction section on the monitor screen of the signal control station. The traffic control for one-sided traffic control can be performed smoothly with a minimum number of personnel, and by installing the equipment of the signal control station in the car, it is possible to quickly respond to a new construction site and Good working conditions can be maintained even in poor conditions. Further, by SS-modulating the image of the camera and transmitting it by a weak electric wave, it is possible to prevent the transmission of the image signal from interfering with others or to be interfered with by others.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an embodiment of a traffic signal switching system according to the present invention.

FIG. 2 is a block diagram of essential parts of an embodiment of a traffic signal switching system according to the present invention.

[Explanation of symbols]

 1, 2 Monitoring terminal 3 Signal control station 4, 5 Traffic signal 11, 21 Television camera 12, 22 SS modulation / transmission section 32 Reception / SS demodulation section 33 Monitor device 34 Input section 35 Timer 36 Signal control section

Claims (6)

[Claims] 1. When traffic signals are installed at both ends of a road construction section to restrict one-way traffic of automobiles due to road construction, etc., and a signal is switched by a required operation, at the end of the road construction section, a road construction section is installed. A television camera that captures an image of the outside direction of the camera, and a modulation / transmission unit that modulates a required high-frequency signal with a video signal from the television camera and transmits by a weak radio wave are provided at the signal control station from the modulation / transmission unit. A receiving / demodulating unit that receives and demodulates the radio wave of, a monitor device that displays based on a video signal from the receiving / demodulating unit, an input unit that inputs switching of traffic signals, and the above-mentioned based on a signal from the input unit. A traffic signal switching system that is equipped with a signal control unit that switches traffic signals, monitors the status of vehicles entering the road construction section on the monitor screen of the signal control station, and switches traffic signals. M 2. The signal control station is provided with a timer for measuring a time required for a vehicle to pass through a road construction section + alpha, and one traffic signal device via the signal control unit by a signal from the input unit. 2. The traffic signal switching system according to claim 1, wherein the traffic signal switching system is switched to red, the timer is started at the same time, and the other traffic signal is switched to blue when the time is up. 3. The television camera and the modulation / transmission unit are respectively installed at both ends of a road construction section, and two sets of the reception / demodulation unit and the monitor device are provided at a signal control station.
The traffic signal switching system according to claim 1 or 2, wherein radio waves from each modulation / transmission unit are respectively received / demodulated and input to a monitor device. 4. The television camera and the modulation / transmission unit are installed at both ends of a road construction section, and two sets of the reception / demodulation unit are installed at a signal control station to receive radio waves from each modulation / transmission unit. The traffic signal switching system according to claim 1 or 2, wherein a screen synthesizing unit is provided for receiving, arranging the images of the video signals from the respective receiving / demodulating units side by side and synthesizing them into one screen, and inputting to the monitor device. . 5. The modulation / transmission unit is a unit for spreading a required high frequency signal by spread spectrum modulation by a video signal from a television camera and transmitting the weak radio wave. The reception / demodulation unit is operated by the modulation / transmission unit. 3. The method of claim 1, wherein the received radio wave is subjected to spread spectrum demodulation, and the demodulated video signal is input to the monitor device.
Alternatively, the traffic signal switching system according to claim 4. 6. Each of the signal control stations is provided in an automobile parked in the vicinity of a road construction section to switch traffic signals, claim 1, claim 2, claim 3, and claim 4. Alternatively, the traffic signal switching system according to claim 5.