JPS63173198A - 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] [Industrial Application Field] This invention relates to a method for controlling traffic signals, that is, signals on expressways. [In addition to installing sensitive fire detectors, one traffic light and multiple variable signs are placed at predetermined intervals from the entrance of the tunnel toward the direction of vehicle arrival. When the sensor is activated, the controller switches the traffic light from "green" to "red" and changes the sign placed in the direction of the vehicle from the traffic light to a predetermined speed lower than the maximum speed of the expressway. The system is characterized in that the speed limit is set, and the speed of the vehicle traveling toward the tunnel entrance is gradually reduced until it stops before the traffic light.

[Conventional technology]

Traditionally, fire detectors have been installed inside the tunnel, and when the fire detector is activated, the traffic light installed near the tunnel entrance is switched from "green" to "red" to stop cars running toward the tunnel entrance. There is one that is designed to stop before the tunnel entrance.

[Study point that invention tries to solve]

In the conventional method, the traffic light suddenly changes from "yes" to "red", which is extremely dangerous for cars traveling at speeds of about 10 km/h and the drivers driving them. This was done to improve the problem.

[Means to solve the problem] Install a traffic light that can switch between blue and red near the entrance of the tunnel, as well as install multiple signs that can change markings from the traffic light in the direction in which cars are coming. They were placed at predetermined intervals, and if a fire detector inside the tunnel was activated, the controller would control the traffic lights and signs.

[Effect]

If the fire detector is activated, the controller will switch the traffic light to its normal state, that is, from "green" to "red", and
A speed limit sign is posted on the sign to gradually reduce the speed of cars traveling toward the tunnel entrance, so that the cars stop before the traffic light. The speed limit will also be flashed to draw the driver's attention to the sign.

〔Example〕

In Figure 1, (1) is a road exclusively for white road vehicles, (21 is a tunnel, and (3I is a fire detector installed in the tunnel that is sensitive to heat or smoke. For convenience, only one is shown here, but the tunnel Needless to say, two or more of them may be provided at predetermined intervals depending on the length. (4) is a controller that receives the detection signal from the fire sensor and controls the traffic lights and signs described later; It is mainly composed of functional elements with calculation and control functions such as a computer.The FB is a blinking signal (flicker signal) generating section in the controller (4), and causes a sign to be described later to blink (e.g. (with a frequency of IHz), and the sign flashes with a flashing signal after the fire detector detects a fire and the designated sign is placed. (51 is a tunnel +
21 entrance + 61 to 11 traffic lights installed in the direction of arrival of only 11 cars (71 is a traffic light (51 to j
The first variable sign is installed at a position 2 mm apart in the direction of the vehicle's arrival and indicates the 1llJ speed limit.

Reference numeral 181 denotes a second sign located at a distance of j3 from the first sign R (71) in the direction of arrival of the vehicle.

Note that the relationship between * J1 * j2 * Is is 11=
Limited to the relationship 12 = Is jh < 12 < Is
e or road conditions such as the relationship j1=J2<13,
Determined by the surrounding environment etc. +91 is a car traveling in the direction of the arrow.

In such a configuration, if there is no abnormality, the traffic light (5
1 is always "blue", and the first sign (7) and the second sign (8) indicate the maximum speed of the motorway (for example, 1
00KIl/h or rora/h).

In such a state, if a fire occurs in the tunnel, the fire detector is activated and provides a detection signal to the controller (41).

The controller (4) thereby outputs a control signal part.

The traffic light (51) is switched from "yes" to "red" and the signs (7) and (81 are changed. In other words, the control signal (1 (-) is used to change the traffic light (51) to "red".

The speed indicator of the first sign (71) is set to, for example, 30b/h, and the speed indicator of the second sign 181 is set to, for example, SOt,/h, and is blinked by a blinking signal (flicker signal) generated from the second blinking signal generator FS.More details If you do so, the speed of the car will gradually decrease before the +51 traffic light.

It goes without saying that the distances K of 12 and 13 must be set in such a way that the braking distance of the vehicle can be taken into account and that the vehicle can sufficiently cope with the speed drop.

Next, the first. The configuration example of the second sign +7) and +81 is
figure.

This will be explained using FIGS. 3 and 4. Figure 2 shows an example of the structure of a sign, where an is a front plate made of glass or plastic that is opaque except for the dot α2 (transparent or translucent), which is the minimum unit for display characters, etc.;
fi3 is a round rod-shaped light guide that forms one dot or a plurality of light guides, is made of transparent plastic, has flexibility, and is made to correspond to each transparent or translucent dot. Note that the dot α2 is a character symbol that will be described later.

Or it forms the smallest unit of a figure (picture). One end of the light guide is fixed to the portion of the front plate an (drill) fi3, and the other end is located at the light generating device 041.

That is, the light generating device I is composed of a light source (for example, a halogen lamp) aS and a reflector (REFIJCTOR) Qli that reflects the light emitted from the light source α, and the other end of the light guide a3 is connected to the It is located at the focal point of the reflector (Ie. Therefore, when the light source αS is turned on by the power from the power source aη, its source enters from the other end of the light guide 0,
Reach one end.

FIG. 3 is 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. Figure 4 shows a sign constructed as in Figures 2 and 3, with a means for changing the sign added (111 is the front plate).

(13-1) to (13-n) are light guides, +141 is a light generator, rota is a light source, αe is a reflector, an is a power source,
(18-1) to (18-n) are optical switches, which are provided in the middle of each of the light guides (18-1) to (1s-n), and are selectively controlled by the selection circuit 111 for each of the nine.

(4) is a controller, and the selection circuit a9 selectively controls the light switch according to a signal generated from this controller (41) when a fire is detected. The flicker signal is given to the power fin and controls the ON/OFF state of the power fin.

Therefore, if a fire in the tunnel is detected and a signal and a flicker signal are generated from the controller +41 to the selection circuit (9), the sign flashes while displaying the predetermined speed limit.

Note that the posted speed limit is different between the first sign and the second sign, and the speed posted on the first sign is slower than the speed posted on the second sign R. In other words, the system takes into account the braking distance of the vehicle, slows the vehicle down in stages, and displays signs to stop the vehicle before the traffic light, and also flashes to attract the driver's attention.

〔Effect of the invention〕

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 can be reduced in stages and stopped before the tunnel entrance. I can do it.

This can prevent the accident from spreading.

In the embodiment, a round rod-shaped light guide made of transparent plastic was used as an example, but it goes without saying that this may be replaced with an optical fiber.

By the way, a sign like the one in the example has an illusory image that is common in conventional signs that use a light source and a dual display mask. This eliminates the phenomenon in which the mask surface looks as if it is lit due to the reflection of sunlight, making it 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, (51 is a traffic light,
(6) is the tunnel entrance, (7) is the first sign, (81
is the second sign, (91 is the car, mackerel is the control signal, α3 is the light guide, aa is the light generator, (15 is the light source, αe is the reflector, αη is the power supply, T18 is the optical switch, aS is the selection circuit , FS is a flashing signal generating section. In FIG. 9, the same or corresponding parts are designated by the same reference numerals.

Claims (2)

[Claims] (1) In addition to installing fire detectors in the tunnels of motorways, install traffic lights that can switch between "green" and "red" at a predetermined distance from the entrance of the tunnel in the direction of vehicle arrival; A plurality of switchable speed limit signs are placed at a predetermined interval in the direction of arrival of vehicles at a predetermined distance from the traffic light, and if the fire detector is activated in response to smoke or heat, a control system is installed. Due to the action of the device, the above traffic light is
At the same time, the sign furthest from the entrance of the tunnel is changed to a speed limit lower than the maximum speed of the expressway, and the sign located between this sign and the above-mentioned traffic light is also changed. The speed limit of the sign located farthest from the tunnel entrance is changed to a lower speed limit than the sign located farthest from the tunnel entrance, and the speed of vehicles traveling toward the tunnel entrance is gradually reduced. A traffic signal control method characterized in that the traffic signal is stopped in front of the traffic signal. (2) A patent characterized in that all the signs placed in the direction from the entrance of the tunnel to the direction of the vehicle are set to the speed limit that requires the vehicle to stop before the traffic light, and then flash at a predetermined period. A traffic signal control method according to claim (1).