JPS5922192A - Control of traffic signal - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control method for traffic signals, that is, road signals.More specifically, the present invention relates to a control method for traffic signals, that is, road signals. Traffic lights and variable signs are installed at predetermined intervals in the direction of arrival of vehicles, and speed detectors are installed to detect the speed of vehicles traveling toward the entrance of the tunnel. If a fire occurs and a fire detector is activated, the above traffic light will be switched from "green" to "red" and a variable marker HA will be set based on the driving speed of the vehicle detected by the speed detector.
There is a patent that features a Y-controlled system that prohibits vehicles from entering the tunnel.

Traditionally, fire detectors have been installed in tunnels, and when a fire detector is activated, a 1-cli alarm is issued, but this does not stop vehicles in motion, resulting in serious accidents involving vehicles following them. No pain.

Therefore, in some cases, a signal a linked to a fire detector is installed at the tunnel entrance, and the signal turns red when the fire detector is activated.
It is dangerous to suddenly stop a car traveling at a certain speed at a red light, and further improvements are needed.

The present invention aims to solve the above-mentioned problem KM and proposes a signal control method with further improvement, which will be explained below with reference to the drawings.

i 1 Figure ic #ite, (1) is an expressway, (2) is a tunnel.

+31) i Fire detectors are installed inside tunnels and are sensitive to smoke or heat.One fire detector is shown here, but it goes without saying that two or more fire detectors may be installed at predetermined intervals depending on the length of the tunnel. (4) is a controller that is connected to the above-mentioned fire detector and a speed detector S such as a well-known radar speedometer, and controls traffic lights and signs described later, and is equipped with calculation and control functions such as a microcomputer. It is composed of functional elements as a living body. (5) is a traffic light located a distance t1 away from the entrance (6) of the tunnel (2) in the direction of arrival of the vehicle, and (7) is located a distance I2 away from traffic light (5) in the direction of arrival of the vehicle. Variable speed limits are displayed on variable signs installed in the area. (8) is a variable sign installed at a position I5 away from the sign (7) in the direction of arrival of the vehicle.

Note that it is limited to the relationship t1=12=15.It<12
(Straight road, such as the relationship of = t2 < t.

It is determined by various road conditions such as curves or crosswind caution areas, and the surrounding environment. (Number 9 is a car moving in the direction of the arrow.

The speed detector 8 is installed at a position 9 predetermined distances away from the sign (8) located farthest from the tunnel entrance in the direction of arrival of the vehicle.

The speed of the oncoming car (9) is detected and a detection signal is given to the controller (4)K. Upon receiving this detection signal, the controller issues a speed limit sign signal according to the vehicle's speed to the sign (71 (give 81K). In other words, the speed limit is based on the actually measured speed and the distance to the traffic light (5) is set as the braking distance. Be determined.

In such a configuration, if there is no abnormality, the traffic light (5
) is always marked as "blue", and signs (7) and (8) are marked as the maximum speed on the expressway (for example, 1100 km/h). In such a state, if a fire occurs in the tunnel, the fire detector (3) is activated and sends a detection signal to the controller (4).

Accordingly, the controller (4) outputs a control signal QIY.

The traffic light (51'4) is switched from "green" to "red" and the signs (7) and (8) are controlled according to the output of the speed detector S described above.

In other words, the control signal 4 turns the traffic light (5) to 1 red, and the speed sign (7) changes to, for example, 30-/
h, set the speed sign (8) to 60 klll/h, for example.
shall be.

To explain in more detail, the speed of the vehicle is gradually reduced before the traffic light (5).

It goes without saying that in order to do this, the distance of I2 e 4 must take into account the braking distance and must be sufficient to cope with the speed drop.

Next, the configuration example of the sign (71 (8+) is shown in Figures 2, 3, and 4.
This will be explained using figures.

Figure 2 shows an example of the structure of a sign (Iυ is a front panel made of glass or plastic that is opaque except for the dot αa (transparent or opaque), which is the minimum unit for display characters, etc.; 03 is a round rod-shaped light guide that forms one dot with one or more pieces, is made of transparent plastic, has flexibility, and is made to correspond to each transparent or semi-transparent dot (Q3). . Note that the dot α2 constitutes the minimum unit of a character symbol or figure (picture) to be described later. One end of the above light guide is the front plate α
υ dot (fixed to part I2, the other end is located at light generating device I).

That is, the light generating device I is composed of a light source (for example, a halogen lamp) IJ9 and a reflector (RKFLEOTOR) (1 (9)) that reflects the light emitted from this light source a4, and the light guide 0 is The other end is located at the focal point of the reflector μυ.

Therefore, when the light source 09 is turned on by power from the power source aη, the light enters from the other end of the light guide θ row and reaches one end.

FIG. 3 shows an example of a case where necessary markings are made based on the configuration shown in FIG. 2, and in reality, speed, that is, numbers are displayed.

Fig. 4 shows a sign constructed as shown in Figs. 2 and 3 with a means for changing the sign added, where Qυ is a front plate, and (13-1) to (13-n) are light guides.

I is a light generator, α9 is a light source, Qυ is a reflector, (Iη is a power supply, (18-1) to (18-n) are optical switches, and the respective light guides (15-1) to (1+ -1
1).

The selection is individually controlled by a selection circuit αj. (4) is a controller, and the selection circuit a9 selectively controls the optical switch based on a signal generated from the controller (4) when a fire is detected.

Therefore, if the controller (4) outputs a control signal to change the speed indicator according to the speed of the oncoming car when a fire is detected, the selection circuit selects the light switch and displays the normal speed indicator. Use lower speed signs.

Therefore, signs f71, f8) and K can indicate speeds for deceleration that take into account braking distances relative to actual measurements in order to stop incoming cars before the traffic light (5).

Since this invention is as described above, if a fire breaks out in a tunnel, the speed of a car traveling towards the tunnel entrance is reduced in stages according to the instructions of the sign, and the vehicle is stopped just before the tunnel entrance. You should be able to stop the vehicle and thereby prevent the accident from escalating.

In the above embodiments, a round rod-shaped light guide made of transparent plastic was used as an example.

It goes without saying that this may be replaced with an optical fiber.

By the way, as in the embodiment, the light guide and the light source.

Signs that combine a reflector consume less power than conventional signs that use a light source and a display mask (representing the shape of displayed characters, etc.), and can be used even when the light source is not energized. Eliminate the illusory image that tends to occur (the phenomenon where the light source is not lit under bright sunlight in conventional signs, but it appears as if it is lit due to sunlight reflection on the display mask surface). is possible,
This is an extremely easy-to-see sign for drivers and others.

[Brief explanation of the drawing]

FIG. 1 is a diagram for explaining the signal control method according to the present invention, and FIGS. 2 to 4 are diagrams showing examples of signs used in the present invention, where (1) is a road, and (2) is a tunnel. ,(
3) is a fire detector, (4) is a controller, (5) is a traffic light,
(6) is the tunnel entrance, (7i (8) is the sign, (9
) is a car. αQ is the control signal, (Iυ stripe front plate, α3 is T), (
1: l is the light guide, +141 is the light generator, ■ is the light source,
uetx reflector. Q7) is the power supply, ttst light switch, +1! J is a selection circuit and S is a speed detector. Note that in FIG. 1, the same or corresponding parts are designated by the same reference numerals. Agent Shin Kuzuno - 62

Claims (1)

[Claims] In addition to providing a fire detector in an expressway tunnel,
A traffic light that can be switched between "green" and "red" is placed a predetermined distance from the tunnel entrance in the direction of the car's arrival, and a sign can be switched in the direction of the car's arrival at a predetermined distance from the traffic light. A plurality of speed limit signs are arranged at predetermined intervals, and a vehicle speed detector is installed at a predetermined distance in the direction of arrival of the vehicle from the sign installed at the farthest position from the traffic light. If the fire detector is activated in response to smoke or heat, the traffic light will be switched from "green" to "red" and the vehicle will drive toward the entrance of the tunnel detected by the speed detector. Based on the speed of the vehicle, the sign located farthest from the tunnel entrance is switched to a speed limit lower than the maximum speed of the expressway, and the other signs located between this sign and the traffic light are also displayed. The speed limit is changed to a lower speed limit than the sign located farthest from the tunnel entrance. A traffic signal control system characterized in that the speed of a vehicle traveling toward a tunnel entrance is gradually reduced and stopped before the traffic light, thereby preventing the vehicle from entering the tunnel. Method.