KR101542715B1 - System for Warning Dangerous Road Section to a Driver and Inducing Speed Reduction from a Driver - Google Patents

Abstract

The present invention relates to a system which installs display lights along a dangerous road section, changes colors of the display lights according to a speed of a vehicle approaching the dangerous road section to warn a driver, and induces speed reduction of the vehicle naturally in a conditioned reflex to allow the driver to safely pass the dangerous road section. The system for warning about a dangerous road section and inducing speed reduction comprises: display lights (10) installed in a longitudinal direction of a dangerous section (DS) on a road; a first speed measurement device (21) installed at a dangerous section preparation speed measurement position (P1) arranged at a remote distance (d1) position in front of the dangerous section; a second speed measurement device (22) installed at an entering speed measurement position (P2) arranged at a close distance (d2) position in front of the dangerous section; and a controller (30) to receive a speed information signal measured by the first speed measurement device (21) and a speed information signal measured by the second speed measurement device (22) to control at least lighting colors of the display lights. A distance (d3) between the dangerous section preparation speed measurement position (P1) and the entering speed measurement position (P2) is a prescribed separation distance where a driver who has seen the display lights (10) lit according to a regulation speed can reduce the speed of a vehicle below the regulation speed.

Description

[0001] The present invention relates to a warning system for a dangerous section of a road,

More particularly, the present invention relates to a danger warning system for a road, and more particularly, to provide an indicator to a dangerous section of the road, alert the driver by changing the color of the indicator depending on the speed of the approaching vehicle, And more particularly, to a system for allowing a driver to safely pass a dangerous section by inducing a deceleration of the vehicle reflexively.

 Conventionally, in order to induce the driver to reduce the speed of the vehicle, a speed interrupter camera or the like is provided in a dangerous section of the road, for example, in an emergency curb road or in front of a child protection zone. Many drivers recognize this speed interrupter camera, check their speed on the instrument cluster, adjust the speed of the vehicle and pass through the section.

The problem is that nerves are dispersed in the dashboard as drivers slow down. For example, in the case of a child protection zone, if the environment in which an accident occurs due to such a dispersed driver's gaze is created, the probability of an accident is higher than that of a speeding vehicle watching ahead.

In order to solve such a problem, a display device for measuring the speed of a passing vehicle and displaying the speed of the vehicle to the driver of the vehicle is installed on the road. This allows the driver to check his speed without having to look at the instrument cluster.

This form, however, is equally dispersed in looking at numbers and does not provide motivation to reduce the driver's speed. In other words, if the driver becomes accustomed to such a device, he will not pay close attention to the device, and the accident prevention effect will be significantly reduced. In addition, this form is no longer effective at high-speed sections such as highways.

Korean Patent Publication No. 1031995 discloses an electric signboard for displaying various information in a child protection zone. As can be seen, these devices display the speeds measured in one area in front of the child protection area on the display board (two speed measurement segments are adjacent to one another, which is for verifying the speed) If you get used to it, you will not be able to see the device well, and the accident prevention effect will be reduced.

Japanese Laid-Open Patent Application No. 2009-90558 discloses a system in which, when the speed of a vehicle approaching from a child protection zone is higher than a specified speed, the traffic lights turn red to forcibly stop the vehicle. This is because the speed is measured by only one speed sensor and the traffic light is forcibly changed into the stop signal so that the driver forcibly stops the vehicle. Therefore, there is a problem that the speed of the preceding driver is penalized to the trailing driver, There is a problem that it interferes.

In Patent Publication No. 2011-39110, an induction lamp is provided along a longitudinal direction inside a tunnel. The speed is measured at the moment of entering the tunnel. When it is judged that the speed is overspeed, the induction lamp is displayed in red, The speed of the vehicle is measured and the induction lamp is turned to red when the vehicle is overspeed. However, since the speed of the moment when the tunnel enters the danger zone is measured and displayed on the induction lamp inside the tunnel, it can not induce the driver to reduce the speed in advance before entering the tunnel, The result of checking the speed of his own is not until he enters the section. Therefore, it can be said that there is no installation effect in such a place where it is necessary to reduce the speed sufficiently before entering the danger zone so that the accident can be prevented.

Patent Registration No. 1031995 Published Japanese Patent Application No. 2009-90558 Published Patent Publication No. 2011-39110 Patent Publication No. 2014-3169

SUMMARY OF THE INVENTION The present invention has been conceived to solve the problems described above, and it is an object of the present invention to provide an indicator in accordance with a danger zone so that a driver can detect a danger zone in advance before entering a danger zone, By controlling the color of the light, the driver is guided to intuitively and reflexively reduce the speed before entering the danger zone. By controlling the color of the indicator according to the speed of the vehicle again just before the danger zone, And to provide a danger section warning and deceleration inducing device capable of once again confirming the vehicle speed of the vehicle.

In order to achieve the above object, the present invention provides a display device comprising: a display lamp (10) installed along a longitudinal direction of a danger zone (DS) on a road; A first speed meter (21) installed at a speed measuring position (P1) relative to the danger zone arranged at a long distance (d1) in front of the danger zone; A second speed meter (22) installed at an entry speed measurement position (P2) disposed at a near (d2) position in front of the danger zone; And a controller (30) for receiving at least the speed information signal measured by the first speed meter (21) and the speed information signal measured by the second speed meter (22) to control at least the lighting color of the indicator lamp Provides a section warning and deceleration guide

The distance d3 between the speed measuring position P1 and the entering speed measuring position P2 is set such that the driver of the vehicle is allowed to decelerate at a specified speed or less .

The controller 30 displays the red color when the speed of the vehicle C measured at the speed measuring position P1 with respect to the danger zone is not less than the specified speed and the green when the speed is less than the specified speed, If the speed of the vehicle measured at the speed measuring position P2 is equal to or higher than the specified speed, red is displayed, and if less than the specified speed, green is displayed on the indicator 10.

The indicator may comprise an LED.

The display lamp 10 may be normally displayed in white or yellow.

The indicator lamp 10 is displayed in a blinking manner and the blinking speed may be faster when the color of the indicator lamp is red than when the color of the indicator lamp is red.

The controller can display the indicator light 10 in yellow when the measured speed of the vehicle is equal to or higher than a specified speed and the over speed is equal to or lower than a predetermined speed.

When the speed information signal of the entry speed measurement position P2 is received, the controller 30 generates a color corresponding to the display lamp 10 based on the speed information signal regardless of the color of the current display lamp 10 And when the lighting color is displayed by the speed information signal of the entry speed measurement position P2, the color display can be maintained during the lighting sustain period T2.

When no speed information signal is received at the two measurement positions P1 and P2 during the lighting sustaining period T2 after the indicator lamp is turned on in accordance with the vehicle speed measured at the entry speed measuring position P2, The color can be displayed on the display lamp 10.

When the speed information signal is received at the measuring position P1 during the lighting maintaining period T2 after the lamp is turned on in accordance with the vehicle speed measured at the entry speed measuring position P2, And displays the hue corresponding to the display lamp 10 on the basis of the speed information signal of the measurement position P1 and displays the color of the display area 10 after the initialization period T0 has elapsed from the time when the speed information signal is received at the measurement position P1 If no speed information signal is received until then, the controller can display the normal color on the display lamp 10.

When a new speed information signal is received at the measurement position P1 before the initialization period T0 elapses from the time when the speed information signal is received at the measurement position P1, Can be prioritized.

A sensor for detecting the road surface condition may be installed in the danger zone, and the predetermined speed stored in the controller 30 may be changed according to the condition of the road surface measured by the sensor.

According to the present invention, the driver can visually and intuitively confirm the danger zone in advance of the speed measurement position relative to the danger zone. Especially when the indicator light in the danger zone is yellow.

Also, if the speed indicator is over speed in case of over speed, the driver who is accustomed to the traffic lights can induce the condition to reduce the speed in a reflexive manner. When changed, the driver is safe and is able to enter the danger zone at that speed.

In case of over speed, the indicator will continue to be displayed in red so that the driver can continue to decelerate. If the speed becomes less than the specified speed at the entry speed measurement position and the indicator turns green, the driver Can pass the danger zone without too much deceleration within the specified speed without worry.

At this time, the indicator lamp can be displayed by flashing. If it is red, the faster the flashing speed, the more intuitive the driver can be informed about the danger.

Also, in the section that does not exceed the prescribed speed, it is displayed in yellow instead of red, so that the driver himself can intuitively check the degree of over speed. In particular, since yellow is a color that passes through the traffic light system before the green turns to red, it can induce natural deceleration by the driver who is accustomed to the stop signal system and sequence.

Further, according to the present invention, after the vehicle has passed through, it can naturally return to the normal color, thereby continuously informing the next vehicle of the danger zone in advance.

In addition, according to the present invention, when a plurality of vehicles pass, the signal measured at the entry speed measurement position is lighted based on priority and is maintained for a predetermined time, so that information can be preferentially provided to a vehicle entering a danger zone, Even if the speed information at the time of passing the speed measuring position relative to the danger zone is not provided through the indicator of the danger zone, it is possible to see the deceleration condition of the preceding vehicle and the color of the indicator, It is possible to naturally reduce the speed while maintaining the inter-vehicle distance.

In addition, according to the present invention, it is possible to induce deceleration of the driver in a wake-up state-customized manner by operating the specified speed in accordance with the road surface state.

The above and other objects, features and advantages of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: FIG.

FIG. 1 is a schematic view of an apparatus for warning and decelerating a dangerous section of a road according to the present invention. FIG.
FIG. 2 and FIG. 3 are views showing an example of the operation of the display by the system according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

It is to be understood that the present invention is not limited to the disclosed embodiments, but may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, It is provided to inform.

There are many danger zones on the road. For example, these danger zones include child protection zones, rapid curve roads, rockfall roads, and transverse wind roads, and such dangerous sections must proceed with reduced speed.

The above-mentioned danger zone is not a certain point, but literally a section of a certain distance along the longitudinal direction of the road.

1, which schematically shows an apparatus for warning and decelerating a dangerous section of a road according to the present invention, the present invention is characterized in that a dangerous section along a longitudinal direction of the danger zone DS is divided into a plurality of (10) are spaced apart at regular intervals. For example, in the case of a highway, the indicator light 10 may be installed in an interval of 200 m at intervals of 25 m, and in the case of a national road, the indicator light 10 may be installed at intervals of 20 m in an interval of 150 m, It can be installed all over the curve area. That is, the installation interval can be determined according to the characteristics of the road. It is needless to say that the technical idea of the present invention does not exclude the provision of a horizontally long type of indicator lamp along the longitudinal direction of the danger zone.

In one example, the display lamp 10 of the present invention may include an LED (light emitting diode). Since the LEDs are small in size, if the LEDs emitting different colors are arranged in a matrix form adjacent to each other, it is possible to achieve the same effect as changing the lighting color without changing the lighting position greatly.

The controller 30 controls the lighting of the display lamp 10 such as lighting color, flickering, blinking interval, and the like. Accordingly, the display lamp 10 may be turned on by the controller 30 in a color such as red, green, yellow, white, etc., and may be turned on or off in a blinking manner so as to maintain the on- The blinking speed can also be changed.

To induce all drivers to drive safely, it is necessary to induce the driver to unconsciously reduce the speed in a reflexive manner before entering the danger zone.

The present invention is similar to the case where the traffic light is changed from yellow to red when the driver is over-driving (distance of d1) before reaching the danger zone, based on the color of the traffic light familiar to all drivers, The controller 10 controls the driver 10 to reduce the speed of the vehicle in a conditionally reflexive manner. When the driver approaches the danger zone a little more (distance d2), the speed is measured again to check whether the vehicle is decelerating. By controlling the lights, the driver can again judge his / her speed immediately before the danger zone through the color of the indicator.

The present invention is characterized in that a first speed meter 21 is installed at a long distance d1 to a danger zone DS and a short distance d2 nearer to the danger zone DS than a position at which the first speed meter 21 is installed and the second speed measuring instrument 22 is installed in the second speed measuring instrument d2. The first speed measuring instrument 21 and the second speed measuring instrument 22 can transmit the passing speed information of the vehicle measured at the corresponding position to the controller 30 in a wired or wireless manner.

Hereinafter, the position where the first speed measuring instrument 21 is installed is referred to as a speed measuring position P1 with respect to the danger section and the position where the second speed measuring instrument 22 is installed is referred to as an entering speed measuring position P2.

For example, the speed measuring position P1 for the danger zone may be a distance d1 of 150 m from the danger zone DS for the highway, and the entering speed measurement position P2 may be a distance dm of 50 m from the danger zone DS And may be a position separated by a distance d2.

In the present invention, the distance d3 between the two measurement positions P1 and P2 is a distance enough to decelerate to reach the arrival speed measurement position P2 at the speed measurement position P1 relative to the danger zone. However, if the distance d3 is too long, the vehicle may be unconsciously decelerated, and the interval may be too long to accelerate again. Therefore, it is preferable to appropriately select the speed in consideration of the average speed of the speeding vehicle passing through the interval.

This distance d3 is also related to the speed limit of the road. For example, a highway with a high speed limit will have a longer distance (d3) than a public road, and the distance will be shorter in a child rest area with a speed limit of 30 km / h.

The controller 30 receives the speed information signal measured by the first speed meter 21 and the speed information signal measured by the second speed meter 22 to control the lighting color, the blink speed, and the like of the indicator. The controller 30 also controls the lighting of the display lamp 10 at normal times.

According to the present invention, the controller 30 normally turns on an indicator lamp in yellow (or white).

When the speed of the vehicle C measured at the speed measuring position P1 with respect to the dangerous section is significantly higher than the specified speed, the controller 30 displays the red color, the yellow color when the speed is slightly higher than the specified speed, Is displayed on the display (10). For example, if the measured speed of the vehicle is 120 km / h or more, the red light is displayed. If the measured speed is 100 km / h, the red light is displayed. If the measured speed is 100 km / h, Can be displayed.

Similarly, the controller 30 displays red when the speed of the vehicle C measured at the entry speed measurement position P2 is significantly higher than the specified speed, yellow when the speed is slightly higher than the specified speed, Is displayed on the display (10).

As described above, the distance d3 between the speed measuring position P1 and the entering speed measuring position P2 is determined by the driver of the vehicle according to the predetermined speed Or less. For example, in the case of a highway, the distance d3 between the speed measuring position P1 and the entering speed measuring position P2 with respect to the danger zone may be 100 m.

Hereinafter, the basic operation of the above-described embodiment according to the present invention will be described.

If the driver approaches the danger zone (DS), the driver will instantly see that the traffic light has passed from green to red, seeing the yellow color of the indicator light (10) installed in the danger zone. When turned on, it goes from red to green, so yellow is the color of the traffic lights that can only be seen when a red light is on). Therefore, the driver unconsciously strikes the corresponding section while at least refraining from accelerating as much as possible.

Then, when the vehicle C passes the speed measuring position P1, the speed signal measured by the first speed measuring device 21 installed at the speed measuring position P1 is transmitted to the controller 30. [ Then, when the speed of the measured vehicle exceeds a predetermined speed (for example, 120 km / h or more) and the speed of the measured vehicle is below a predetermined speed (for example, 100 to 120 km / h), the indicator 10 is turned on in green when the measured speed of the vehicle is within the specified speed (for example, 100 km or less).

When the driver is overspeed at a speed of, for example, 120 km / h or more, the indicator light 10 is turned to red, and the driver can unconditionally induce the behavior to reduce the speed conditionally and reflexively. When the driver is overspeed within a predetermined speed of 100 to 120 km / h, the indicator is continuously displayed in amber to continue to drive the driver's attention. When the driver is driving at a speed of less than 100 km / h, the driver will see the green of the illuminated indicator with confidence and still watch the danger zone (DS) carefully.

When the vehicle approaches the danger zone DS and reaches the entry speed measuring position P2, the vehicle can be in a state in which the vehicle has already traveled a considerable distance d3 and thus the speed can be sufficiently decelerated.

Then, when the vehicle C passes the speed measuring position P2, the speed signal measured by the second speed measuring instrument 22 installed at the speed measuring position P2 is transmitted to the controller 30. [ Then, when the speed of the measured vehicle exceeds a predetermined speed (for example, 120 km / h or more) and the speed of the measured vehicle is below a predetermined speed (for example, 100 to 120 km / h), the indicator 10 is turned on in green when the measured speed of the vehicle is within the specified speed (for example, 100 km or less).

When the driver is still overspeed to 120 km / h or more and the display lamp 10 keeps the red color or accelerates unintentionally in the section d3 to 120 km / h or more, Likewise, the driver can unconsciously induce a behavior that slows down continuously or once again. When the driver is overspeed within a predetermined speed of 100 to 120 km / h, the indicator is continuously displayed in amber to continue to drive the driver's attention. If the driver is driving at a specified speed of 100 km / h or less, the driver will be able to pass the danger zone (DS) with confidence without worrying about any further deceleration. For reference, the above-described basic operation mode can be represented by (a) in Fig.

As described above, according to the present invention, a driver can clearly recognize a danger zone (DS) by seeing an indicator (10) installed in a danger zone (DS) It induces the driver to reflexively decelerate already before reaching the danger zone (DS).

In addition, the green display within the specified speed allows the driver to drive economically without over-deceleration, and these colors are intuitively perceived, so that the driver can avoid dispersing his gaze to see the instrument panel.

At this time, the indicator may be controlled to blink to inform the driver of the risk more intuitively, and the blink rate may be faster when the color of the indicator is red than when the indicator color is green, The risk can be felt.

Meanwhile, the danger warning and deceleration induction apparatus according to the present invention can vary the prescribed speed according to the road surface condition of the danger zone. For example, Korea has 20% deceleration in rain and 50% deceleration in snow. Therefore, in the system for allowing drivers to operate safely in a dangerous period as in the present invention, it is preferable that the prescribed speed is varied according to the road surface condition.

Accordingly, the present invention further includes a sensor (not shown) for detecting the road surface condition of the danger zone, and can operate at a variable speed according to the condition of the road surface measured by the sensor.

The basic operation of the present invention described above is based on the premise that one vehicle C passes completely from the speed measuring position P1 to the dangerous section DS with respect to the dangerous section without the other vehicle being nearby or without changing the lane .

However, since the actual road section is operated by changing the speed of the vehicle at various speeds, it is possible to have two or more vehicles ranging from the speed measuring position (P1) to the dangerous section (DS) .

Accordingly, the present invention addresses the above situation by the following rules.

I. The most basic premise of the system according to the present invention is that the information of the vehicle entering the danger zone (DS) should be preferentially displayed on the indicator (10) rather than any other information.

Therefore, when the controller 30 receives the speed information signal of the entry speed measurement position P2, the controller 30 determines whether the present indicator 10 is in any speed information signal, regardless of the lighting color of the current indicator 10, The color corresponding to the display lamp 10 is displayed on the basis of the speed information signal of the newly received entry speed measurement position P2 irrespective of whether or not the display lamp 10 is based on the input speed measurement position P2.

When the controller 30 receives the speed information signal of the entry speed measurement position P2 (FIG. 2 (b)) in a state in which the current vehicle has not passed through a considerable period of time and is normally displayed as white or yellow, When the controller 30 receives the speed information signal of the entry speed measurement position P2 in a state in which the hue corresponding to the indicator 10 is displayed based on the speed information signal at the current dangerous section speed measuring position P1 (A) of FIG. 3, and the color corresponding to the display lamp 10 is displayed based on the speed information signal at the entry speed measuring position P2 by the vehicle ahead of the present time When the controller 30 passes the position P2 and receives a new speed information signal at the entry speed measurement position P2 (Fig. 3 (b)), the controller 30 receives the latest received speed measurement position Based on the speed information signal of the light source P2, (10) is turned on.

II. When the lighting color is displayed on the indicator by the speed information signal of the entry speed measurement position P2, the controller 30 maintains the color display during the lighting sustain period T2.

Therefore, even if the controller 30 receives the speed information signal at the speed measurement position P1 with respect to the danger zone during the lighting maintenance period T2, the color corresponding to the speed information signal is not displayed and when the preceding lighting maintenance period T2 expires (Fig. 3 (c)).

However, when the controller 30 receives a new speed information signal at the entry speed measuring position P2 (Fig. 3 (b)), the controller 30 can detect a new And color is displayed based on the speed information signal. This is to provide speed information of the vehicle to the vehicle immediately before entering the danger zone (DS) as described above.

The lighting maintenance period T2 may be set to a time required for the vehicle to pass the danger zone DS at a speed 10% higher than the predetermined speed or the specified speed.

III. When the controller 30 does not receive any speed information signal at the two measuring positions P1 and P2 during the lighting sustaining period T2 after displaying the lighting color on the indicator by the speed information signal of the entry speed measuring position P2 , The controller displays the normal hue on the display 10 (Fig. 2 (b), Fig. 3 (a), and Fig. 3 (b)).

That is, this process can be said that the system is initialized because there is no vehicle traffic during the lighting maintenance period T2.

IV. On the other hand, when the controller 30 displays the lighting color on the indicator by the speed information signal at the entry speed measuring position P2 and then receives the speed information signal at the measuring position P1 during the lighting sustaining period T2 The controller 30 displays a hue corresponding to the display lamp 10 based on the speed information signal of the measurement position P1 after the lighting maintenance period T2 is completed.

On the other hand, when the controller 30 does not receive any speed information signal until the initialization period T0 elapses from the time when the speed information signal is received at the measuring position P1 (Fig. 2 (a), c)}, the hue is normally lighted on the display lamp 10.

This initialization period T0 can be set as a time taken for the vehicle to pass the distance d3 between the measurement position P1 and the measurement position P2 at a speed or a specified speed that is reduced by about 20% from the specified speed.

On the other hand, when a new speed information signal is received at the measurement position P1 before the initialization period T0 elapses from the time when the speed information signal is received at the measurement position P1, (Fig. 3 (d)). This is because if the speed of the preceding vehicle is reduced by providing the speed information of the preceding vehicle, the following vehicle will have to decelerate to some extent in order to maintain the safety distance with the preceding vehicle.

to sum up,

In normal and P1, display by P1 takes priority,

In normal and P2, display by P2 is given priority,

Among P1 and P2, display by P2 has priority,

Among the preceding P2 and the following P2, the display by the trailing P2 is given priority,

Among the preceding P1 and the following P1, the display by the preceding P1 takes precedence,

The lighting sustaining period of P2 is T2,

The initialization period of P1 is T0.

According to this control method, even when two speed measuring positions which are considerably separated from each other are operated, the most appropriate information can be displayed on one indicator lamp, so that the system of the present invention can be operated very efficiently and reasonably.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It is obvious that it can be done. Although the embodiments of the present invention have been described in detail above, the effects of the present invention are not explicitly described and described, but it is needless to say that the effects that can be predicted by the configurations should also be recognized.

10: Indicator light (LED)
21: First speed meter
22: Second speed meter
30: Controller
DS: Danger zone
P1: Speed measurement position relative to danger zone
P2: Entry speed measurement position
d1: Distance between the danger zone and the speed measurement position relative to the danger zone
d2: Distance between danger zone and entrance speed measurement position
d3: Distance between the velocity measurement position and the arrival velocity measurement position relative to the danger zone
C: vehicle
T0: Initialization period
T2: duration of lighting

Claims (10)

A display lamp 10 installed along the longitudinal direction of the danger zone DS on the road;
A first speed meter (21) installed at a speed measuring position (P1) relative to a danger zone, which is disposed at a first distance (d1) before entering the danger zone, with reference to the direction of vehicle entry;
A second speed meter (22) provided at an entry speed measurement position (P2) disposed at a second distance (d2) closer to the first distance before entering the danger zone, with reference to an approach direction of the vehicle; And
And a controller (30) for receiving the speed information signal measured by the first speed meter (21) and the speed information signal measured by the second speed meter (22) and controlling at least the lighting color of the indicator lamp As a warning and deceleration induction device,
The controller (30)
A red color is displayed when the speed of the vehicle C measured at the speed range relative to the danger zone P1 is equal to or higher than the specified speed,
A red color is displayed when the speed of the vehicle measured at the entry speed measurement position P2 is equal to or higher than the specified speed,
The distance d3 between the speed measuring position P1 and the entering speed measuring position P2 is set such that the driver of the vehicle is allowed to decelerate at a specified speed or less Wherein the predetermined interval is a predetermined distance.
The method according to claim 1,
Wherein the indicator is composed of LEDs.
The method according to claim 1,
Wherein the indicator (10) is normally displayed in white or yellow.
The method according to claim 1,
Wherein the indicator light (10) is displayed in a blinking manner, and the flashing speed is faster when the color of the indicator is red than when the indicator color is green.
The method according to claim 1,
Wherein the controller displays the indicator light (10) in yellow when the measured speed of the vehicle is equal to or higher than a specified speed and the over speed is equal to or lower than a predetermined speed.
The method according to claim 1,
The controller (30)
A color corresponding to the display lamp 10 is displayed on the basis of the speed information signal regardless of the color of the current display lamp 10 when the speed information signal of the entry speed measurement position P2 is received,
And maintains the color display during the lighting sustaining period (T2) when the lighting color is displayed by the speed information signal of the entry speed measuring position (P2).
The method of claim 6,
Wherein the controller displays the normal color on the display lamp (10) when no speed information signal is received at the two measurement positions (P1, P2) during the lighting sustaining period (T2) Device.
The method of claim 6,
When the speed information signal is received at the measuring position P1 during the lighting sustaining period T2 after the lighting maintaining period T2 is ended, And displays the color corresponding to the "
The controller displays the normal color on the display lamp 10 when no speed information signal is received from the time when the speed information signal is received at the measurement position P1 to the elapse of the initialization period T0 The danger zone warning and deceleration device.
The method of claim 6,
When a new speed information signal is received at the measurement position P1 before the initialization period T0 elapses from the time when the speed information signal is received at the measurement position P1, And the indication is given priority.
The method according to claim 1,
A sensor for detecting the state of the road surface is installed in the danger zone,
Wherein the predetermined speed stored in the controller (30) is changed according to the state of the road surface measured by the sensor.

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