JPS63265397A - Control method for traffic control signal - Google Patents

Abstract

PURPOSE:To previously prevent an accident from occurring in case of earthquake occurrence by fitting an earthquake sensor on a bridge and also providing a signal, plural variable indicators, a speed detector, and a display device successively in the arrival direction of vehicle from in front of the bridge. CONSTITUTION:The signal 5 illuminates in blue at all times unless an earthquake takes place and the indicators 7 and 8 indicate the maximum speed (e.g. 50km/h) of the road. Then when earthquake motion occurs to make the earthquake sensor 3 send a sense signal to a controller 4 and its intensity is larger than specified, the controlled 4 outputs a control signal 10b to display the earthquake occurrence and speed reduction on the display device 20, and turns the signal 5 to red. Then the indicators 7 and 8 are controlled according to the output of a speed detector S to indicate, for example, 20km/h and 30km/h respectively. Further, the blinking signal generation part F in the control part 4 blinks the display of the display device 20 and the indications of the indicators and the traveling of vehicles is controlled through the display and indications, thereby previously preventing an accident from occurring.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This 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. In addition, there will be traffic lights and variable speeds at predetermined intervals from the front of the bridge toward the direction of vehicle arrival.

A speed detector is installed to detect the speed of vehicles driving toward the bridge, and an indicator is installed to notify all drivers in the event of an earthquake. In the above cases, the prescribed display will be displayed on the above display, and the above traffic light will change from "1t" to "red".
The system is characterized in that the variable sign is controlled based on the speed of the vehicle detected by the speed detector, thereby restricting the entry of vehicles onto the bridge.

[Conventional technology]

Traditionally, trains have been forced to stop eight trains if an earthquake detector is activated, but this is still not sufficient for roads and long bridges.

[Problem that the invention seeks to solve]

In the case of an earthquake of a certain degree of seismic intensity, it is extremely dangerous for cars to drive over bridges such as long bridges, and cars driving toward the bridge must be stopped in front of the bridge depending on the seismic intensity.

[Means for solving problem f]

In addition to installing earthquake detectors on the bridge, a traffic light and multiple variable signs will be installed from the front of the bridge toward the direction of vehicle arrival.
A speed detector that detects the speed of the car and a display that notifies the driver in the event of an earthquake are installed at predetermined intervals to notify the driver of the occurrence of an earthquake. 31! 51C to control the above traffic lights and variable signs based on the speed of oncoming vehicles.

[Effect]

If the seismic intensity of an earthquake detected by an earthquake sensor exceeds a predetermined seismic intensity, the display will indicate whether an earthquake has occurred. A display will be displayed to inform drivers, the traffic light will be switched from "Iku" to "Red," and the sign will display the specified speed limit based on the actual value t of the vehicle detected by the speed detector. and the display will flash together, and the vehicle will gradually slow down and stop in front of the bridge as it approaches the bridge.

〔Example〕

In Figure 1, (1) is a road, (2) is a bridge such as a long bridge that spans an ocean, (31 bridge piers (6) K installed seismic motion sensor, (the center is above) A seismic motion sensor and a speed sensor such as the well-known radar speedometer are connected to the traffic lights described below.

A controller for controlling a sign a and a display.

For example, does it have arithmetic and control functions like a microcomputer? It is mainly composed of functional cost elements. This controller normally outputs a control signal (10a), but if an earthquake occurs and the seismic intensity is higher than a predetermined intensity, the display will display all the predetermined information, and the signal will be changed to switch the traffic lights and signs. Control signal (1ab)'f ratio is output. (
5) is a traffic light installed at a distance t1 from the bridge pier (61 in the direction of arrival of the vehicle), (7) is a traffic light (5)
The control speed is variably indicated by a first variable sign installed at a position t2 away from the vehicle in the direction of arrival of the vehicle. Reference numeral 181 denotes a second variable sign installed at a position ts away from the above sign (71) in the direction of arrival of the vehicle.

Note that the relationship t1=mu=ts is limited to tl<t2<63
．． Alternatively, it can be determined depending on the extreme road conditions such as straight roads, curves, or areas where crosswinds are required, such as the relationship t1=t2<ts, and the surrounding environment. ■ What if an earthquake occurs? This is a display device that displays information to inform the driver.For example, #[t is shown in Figure 5]. As the 0 indicator, it is preferable to use, for example, a dot-type electric indicator, which is easily visible regardless of day or night. (9) is a car traveling in the direction of the arrow.

Pa is a blinking signal (flicker signal) generator in the controller (4), which causes the above signs and indicators to blink;
Above 1. The second sign flashes after a sign is made to slow down the single-tube vehicle traveling on the vehicle.

The speed detector S is installed at a predetermined distance in the direction of arrival of the vehicle from the second marker dt+81, which is installed at the farthest position from the bridge.
) is detected and a detection signal is given to the controller (4!).

Upon receiving this detection signal, the controller outputs a speed limit sign signal according to the speed of the vehicle. Give $2 sign +71 +81.

In other words, the control speed is determined based on the actually measured speed at the traffic light (5
1 is determined as the braking distance.

In such a configuration, when an earthquake does not occur, the control signal (10a) turns the traffic light (5) "green".

1st. The second signs (7) and (8) are marked as the maximum speed of the road (for example, 50 Km/h).

In such a state, an earthquake occurs and a sensing signal is given from the sensor (3) to the controller (4), and if the seismic intensity is above a predetermined level, the controller (4) outputs a control signal (101). Indicator (a) K For example, display as shown in Figure 5, and change the traffic light (5) from "green" to "red" K
switching, and the first and second marks (71 and 181 i
- Control according to the output on the 6th day of speed detection described above.

In other words, the control signal (101))K causes the display (to)
In addition to displaying the prescribed display, the traffic light (5)? r red J
K, and the first speed sign a (71 speed sign, for example 2
0 Km/h, and the speed indication of the second sign (8) is, for example, 3Q Km/h.

To be more specific, the speed of the vehicle approaching the bridge is gradually reduced before the bridge, and the vehicle is brought to a stop in front of the bridge.

It goes without saying that the distances t2 and t15 must be sufficient to cope with the speed drop in consideration of the braking distance.

Next, the configuration example of the sign (71181 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, where αD is a dot α3 (transparent 8A or opaque) f, which is the minimum unit of display characters, etc.
α1 is a round bar-shaped light guide formed of one or more dots, made of transparent plastic, and has flexibility. Each transparent or translucent dot (12 corresponds to the dot) (13 is the minimum unit of the letter symbol # or figure (picture) to be described later. One end of the light guide is The front plate αυ is fixed to the front plate (Dragon) (13), and the other end is located at the light generating device I.

That is, the light generating device I is composed of a light source (for example, a halogen lamp) a, a reflector (RFliPI, FtCTOR) a (i) that reflects the light emitted from the light source α9, and the light guide αj. The other end is located at the focal point of the reflector α.

Therefore, when the light source as is turned on by the power from the power source αη, the light enters from the other end of the light guide α3 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 configured as shown in Figs. 2 and 3 with a means for changing the sign added, where aυ is a front plate, (15-1) to (13-n) are light guides, α4 is a light generator, αri is a light source, and αυ is a reflector.

an is a power supply, (18-1) to (18-n) are optical switches, and each light guide (13-1) to (1
3-n), and each one is selectively controlled by a selection circuit al. (4) a controller, and the selection circuit αl selectively controls the optical switch according to a signal generated from the controller (4). Further, the flicker signal generated from the blinking signal generator Il'S of the controller (4) is applied to the power supply αη and the display, and these 'foIJ, OFF
Control.

Therefore, the controller (indicator@
Predetermined display? A control signal to change the speed sign according to the speed of the oncoming car? When output, the selection circuit α field selects the optical switch and displays a speed display lower than the normal speed display.

Therefore, it is possible to indicate the speed for deceleration in consideration of the braking distance with respect to the actual value in order to stop the oncoming vehicle before the traffic light (5).

〔Effect of the invention〕

Since this invention is as described above, seismic motion is detected, and if it exceeds a predetermined seismic intensity, a display is displayed to inform the driver of the occurrence of an earthquake, and the driver starts driving toward the bridge. Car speed? Accidents can be prevented by descending in stages according to the instructions on the sign and stopping before the bridge.

Incidentally, in the above embodiment, 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.

Moreover, although the earthquake sensor is attached to the piers that make up the bridge, it goes without saying that it is best to install it near the bridge.

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

The 9mm reflector and 4 combinations consume less power than conventional signs that use commonly used light sources and 2 display masks (representing the shape of displayed characters, etc.), and can be used even when the light source is not energized. This eliminates the illusory image that tends to occur (a phenomenon in which conventional signs with bright sunlight appear as if the light source is not lit due to the reflection of sunlight on the surface of the display mask). This is an extremely easy-to-see sign for drivers and others.

[Brief explanation of drawings]

Figure 1 is a diagram for explaining the signal control method according to the present invention, Figures t#2 to 4 are diagrams showing an example of a sign used in the invention, and Figure tJL5 is a diagram showing an example of a display on a display. Ashi, (l) is the road, (2) is the tunnel, (3I is the seismic motion sensor, (4) is the controller, (51Fi traffic light, (6) is the bridge g, +71181tt weori, +91U car, (
1oa) (tob) is the control signal, +111 is the front plate, Q2 is the dot, α3 is the light guide, α fathom is the light generator,
αS is a light source, (1G is a reflector, αη is a power source, brocade is a light switch, α is a selection circuit, a wire is a display, S is a speed detector, and PS is a flashing signal generator. Note that it is the same in Figure 0) Alternatively, corresponding parts are designated by the same reference numerals.

Claims (1)

[Claims] A seismic motion detection sensor is installed on or near a bridge where cars can pass, and the sensor is connected to a controller that outputs a control signal according to the seismic intensity of the seismic motion. ``Blue'' and ``Red'' in the placed position.
A switchable traffic light is placed, and a plurality of switchable speed limit signs are placed at a prescribed interval in the direction of arrival of vehicles at a predetermined distance from the traffic light, and furthermore, at a position farthest from the traffic light. A vehicle speed detector and an indicator to notify the driver in the event of an earthquake are placed at a predetermined distance from the sign left in the direction of the vehicle. , when the sensor detects an earthquake and the seismic intensity is greater than a preset seismic intensity, a predetermined display will be displayed on the display, and the vehicle speed detected by the speed detector will be displayed. Based on the driving speed, change the display of the sign furthest from the bridge to a speed limit lower than the maximum speed of the road in question, and then change the display of other signs located between this sign and the traffic light farthest from the bridge. The speed limit is changed to a lower speed limit than the posted sign at the location, and all of the above signs and the above display are flashed by the action of the controller, and the above traffic light is changed from "green" to "red". A traffic signal control method characterized in that the speed of a vehicle traveling toward a bridge is reduced in stages by switching the switch, and then the vehicle is stopped in front of the bridge.