JP2011070462A - Traffic jam suppressing assistance device and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To minimize traffic jams which may urge the succeeding vehicles to run slowly or stop for a long period of time still after the leading vehicles start with elimination of the cause urging running slowly or stopping. <P>SOLUTION: An inter-vehicle distance measuring device 3 provided in front of a vehicle 1 measures the inter-vehicle distance between the vehicle 1 and a vehicle 2 running in front, and when the inter-vehicle distance between the vehicles 1 and 2 is below a constant distance fixed on the basis of the acceleration performance of the vehicle 1, a determination device 4 makes an alarm device 5 of the vehicle 1 operate. Since causes of traffic jams may be due to time delay for recovering the inter-vehicle distance at starting as the inter-vehicle distance to the preceding vehicle is made small during running slowly or stopping, an alarm is also sounded during running slowly or stopping. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention uses an inter-vehicle distance sensor to issue a warning to a driver so as to maintain an appropriate inter-vehicle distance according to the acceleration capability of the own vehicle even when traveling at a low speed and when stopping. The present invention relates to a traffic jam suppression assisting apparatus and method for minimizing the traffic jam.

  Conventionally, many proposals have been made as means for alleviating chronic traffic congestion on highways and exclusive roads (for example, Non-Patent Documents 1 and 2 and Patent Documents 2 to 5). However, all of these focus on traffic flow, and no one analyzes the root cause of traffic jams by focusing on vehicle deceleration, acceleration, speed, and position during acceleration.

Non-Patent Document 1 “Measures for traffic congestion on highways” discloses conventional measures for traffic congestion.
Non-Patent Literature 2 “Thorough dissection of“ traffic jam ”” is a general enlightenment written with the intention of what traffic jam is and what kind of scientific knowledge and technical approaches exist.

Patent Documents 1 and 2 are examples of an automatic toll collection system (ETC) for alleviating congestion at toll road tollgates.
These alleviate the traffic congestion by reducing the speed reduction and the stop state that cause the traffic jam as much as possible.

  Patent Documents 3 to 6 convey traffic congestion information obtained by a device installed on the roadside such as a traffic flow sensor to the driver, and encourage use of a lane change or a parking lot.

Japanese Patent Laid-Open No. 05-217041, “Toll Road Toll Collection System” Japanese Patent Application Laid-Open No. 08-287308, “Toll Road Toll Collection Device” Japanese Patent Laid-Open No. 10-105875, “traffic volume control system” Japanese Patent Application Laid-Open No. 2001-307277, “Traffic Traffic Mitigation System” JP 2006-309735 A, “Traffic Traffic Mitigation Device and Method” Japanese Patent Laid-Open No. 2006-309736, “Traffic Traffic Mitigation Device and Method”

Takashi Oguchi “Traffic congestion on highways”, Traffic Engineering, Vol.33 No.6 1998 Takashi Oguchi, “Thorough dissection of“ traffic jam ””, Traffic Engineering Society, August 2005

The automatic toll collection system (ETC) of Patent Documents 1 and 2 described above is intended to alleviate the traffic congestion by reducing the speed reduction and the stop state that trigger the traffic jam, and is caused after the speed reduction and the stop state. It does not suppress traffic congestion to a minimum.
In addition, in the systems of Patent Documents 3 and 4, traffic information is displayed only on the display board installed in the travel section, and only the advance notice of the traffic jam is solved to solve the root cause of the traffic jam and It does not deter.
In addition, the devices of Patent Documents 5 and 6 try to take measures to alleviate traffic congestion by distributing the obtained traffic information individually to each vehicle, but the measures are recommended to change lanes or use a parking lot, It does not have the effect of suppressing itself, and the effect of congestion suppression is limited.

The cause of the traffic congestion is that when the car ahead decelerates and becomes slower than the car behind it, the car behind it approaches the car ahead until it stops and finally there is almost no distance There is a gap between them.
Even when the cause of low speed or stopping is removed and the car ahead starts, the car behind does not start immediately. This is due to a psychological factor that if the vehicle starts immediately, the car ahead may suddenly stop and may cause a collision, and education during the license training that the distance between vehicles is taken to avoid a collision when driving.

However, conversely, at the time of low speed or when stopping, the distance between the vehicles ahead is not required to be large, but rather the distance between the vehicles is annoying the following vehicle.
It is explained below that this philosophy has resulted in the traffic congestion that the driver wants to avoid most.

  If the inter-vehicle distance is reduced when the vehicle is stopped, the following vehicle will actually start after the vehicle in front of the vehicle has started, even if the vehicle ahead stops suddenly. Either after opening or waiting for the inter-vehicle distance to open more than a certain distance that can be relieved at a relatively slower speed than the car ahead. Subsequent cars are forced to run at a slower speed, and when this is repeated, there is finally a car that cannot even start. This is how traffic jams occur.

This phenomenon is a result of stopping the car by closing the space between the car ahead when stopping. In other words, it takes extra time to get back the distance between the cars that were open during the cruise. This extra time is a delay in starting per vehicle. The car behind one of the cars behind the vehicle starts with a further delay than the car behind. In this way, the delay time that is double the number of units that are in series is accumulated as it goes to the back of the line.
When decelerating or stopping, the driver inadvertently closes the car ahead in order to get forward as much as possible, which is the cause of traffic congestion.

  Contrary to the mistaken social belief that “it is better to move forward with a little delay” to suppress traffic jams, each driver is in front of the car ahead of the vehicle, whether it is driving or stopped. You should always try to keep an appropriate distance, but you can't do anything that goes against social conventions. This is the problem to be solved by the present invention.

  The present invention provides a warning to the driver so that the driver always keeps an appropriate distance from the vehicle ahead, regardless of whether the vehicle is traveling, traveling at a low speed, or stopping, thereby promoting the driver's awareness. Eliminate the start delay time of the following car that is the cause.

  If the vehicle can be decelerated or stopped while maintaining a certain distance during deceleration or stopping, the vehicle can start at the same time as the vehicle ahead. If you are decelerating or stopping at a certain distance, the car behind you and the car behind it can start, accelerate, and cruise as if there is no car ahead. it can. This state is no longer a traffic jam. In this way, traffic congestion can be suppressed by maintaining the inter-vehicle distance even during deceleration and stopping.

However, as a custom, a general driver has the property that if the vehicle ahead is decelerating or stopped, he wants to approach the destination and closes the space between the vehicle ahead as much as possible.
In order to make an individual driver stop at an appropriate distance from the vehicle in front, it is effective to issue an alarm as if he refuses to approach the vehicle ahead.

The appropriate inter-vehicle distance depends on the acceleration capability at the start. That is, a vehicle having acceleration capability may have a short inter-vehicle distance to be opened with the following vehicle, and conversely, it is necessary to take a long inter-vehicle distance with the preceding vehicle. This is because if the acceleration capability of the vehicle ahead is inferior, the vehicle with acceleration capability has a short time to reach the cruising speed, so it catches up before the vehicle ahead reaches the cruising speed and is forced to decelerate. Because. This causes a time delay that leads to traffic jams.
On the contrary, for heavy vehicles with low acceleration capability, the inter-vehicle distance with the rear vehicle may be long and the inter-vehicle distance with the front vehicle may be short. Therefore, the acceleration capability of the own vehicle is stored in the determination unit, and the inter-vehicle distance data used for comparison with the actual inter-vehicle distance is set according to the stored acceleration capability of the own vehicle.
That is, a desirable rear inter-vehicle distance and a desirable front inter-vehicle distance are determined in accordance with a power-weight ratio of each vehicle, that is, a value obtained by dividing the vehicle weight by the engine output.
As a specific example, a desirable rear inter-vehicle distance data is set relatively short for a sports car type vehicle, and a desirable front inter-vehicle distance is set relatively long. For heavy vehicles such as buses and trucks, the desired rear inter-vehicle distance data is set relatively long, and the desirable front inter-vehicle distance is set relatively short.
By using this device, it is possible to automatically compare and determine these desirable distances and the current inter-vehicle distances and warn the driver.

  Further, in the future, if it becomes possible to automatically control the vehicle, the vehicle speed may be automatically controlled so as to maintain the inter-vehicle distance by the inter-vehicle distance measuring device and the determining device which are a part of this device.

  The alarm issued by the present invention makes it easier for the driver of the car to maintain a certain distance between vehicles even when decelerating or stopping. As a result, the delay time required to re-establish the inter-vehicle distance at the time of departure can be eliminated, and as a result, the vehicle can start at the same time as the vehicle ahead, and the vehicle ahead is forced to decelerate and stop longer than the time it has been decelerated. You can drive without In other words, traffic congestion is minimized.

  At this time, the car must be decelerated or stopped far from the goal point as much as the distance between the cars, but it can start as if there is no car ahead, so if the cruising speed is 40 km / h The time required to reach the cruising speed is less than 10 seconds, and if you run at the cruising speed, you can run the distance corresponding to the distance between the vehicles in just a moment.

In reality, there are various types of vehicles, and the optimum values of the distances between the vehicles vary, but to simplify the explanation, consider a train of vehicles with the same acceleration performance. For example, it is assumed that the vehicle speeds up to 40 km / h in 8 seconds and then travels at the cruising speed. The inter-vehicle distance is assumed to be constant at 20m. It is 5.4 seconds after accelerating to accelerate to 20m from the stop state. After reaching a cruising speed of 40km / h, it takes just under 2 seconds to travel 20m.
Even if 100 cars are stopped with a distance between them, the last car will run a distance of 2.6km by adding the distance of 20m per car and the length of 100 cars. Takes only 4 minutes. Note that because the inter-vehicle distance is already open, the first car and the last car can start at the same time.

  On the other hand, if you start from the top car while 100 cars are stopped without taking the distance between cars, if you wait for the distance between the previous car to be 20m away and then start, the waiting time will be If you go one vehicle, you will wait for the next one-to-vehicle distance to open, so the later cars will accumulate and double, and the last car will accelerate to 99m in 5.4 seconds to reach 20m It will be left in a state where it cannot move for about 9 minutes. Since it takes about 50 seconds to drive a car of 600m length from here, it will take almost 10 minutes in total. It takes about twice as long as 4 minutes.

If the traffic is 10km and there are simply 6m cars, the number of cars will be about 1600. Based on the same assumptions, the time it takes for the 1600 rear tails with a 20m distance to the head vehicle position is about one hour because the distance between the last 1600 cars and the head is 41.6km. This is no different from running at a cruise speed of 40 km / h.
On the other hand, if the vehicle is stopped without taking the distance, the waiting time to start is 5.4 seconds for 1600 cars, which is 144 minutes. In addition, since it takes 15 minutes to travel 10km, this calculation will take approximately 2 hours and 39 minutes in total.

Strictly speaking, the following car does not start to move until the inter-vehicle distance is sufficiently wide, so there is no difference so far, but there is a psychology that if you do not take enough inter-vehicle distance to run with confidence at the cruise speed Because it works, even if it starts to move after all, it is forced to drive slower than the previous car until the inter-vehicle distance increases. The car behind is slower than the car in front, and gradually decelerates as you move backwards, so the car behind some cars cannot move at all, so this is not a qualitative argument. If there is a waiting time that you can't run as expected, it becomes a time delay and accumulates in the following cars.
Assuming that the total mileage of the last car is 100km, the total travel time is 2 and a half hours when driving at a cruising speed of 40km without any traffic jams while keeping the inter-vehicle distance. At the same time, if the leading car 10 km ahead starts, the total travel time of 90 km and the time required to exit 10 km of traffic will be less than 5 hours.

In this way, according to the alarm according to the present invention, the delay time to wait until the inter-vehicle distance increases does not accumulate, so the following vehicle can start at the same time as the start of the leading vehicle, and the cause of the congestion leading vehicle has slowed down or stopped There will be no delay or accumulation in the following cars beyond the time it took to resolve. Compared to a congested vehicle train that is stopped shortly, the more vehicles in series, the sooner the destination can be reached according to the alarm according to the present invention.
If all the vehicles maintain an appropriate inter-vehicle distance at a low speed and when stopped, it has the effect that the vehicle can run as if there is no vehicle ahead.

The effect is not only that the car can arrive at the destination early. Cars often keep their engines running so that they can always travel at low speeds in heavy traffic. The later the arrival at the destination, the more energy is wasted and the greenhouse gases are wasted.
By using the traffic jam suppression assisting device according to the present invention, and following the rule that the distance between vehicles is not further reduced according to the alarm of the present device even when the driver decelerates and stops, the traffic jam is suppressed, and the driver is minimized to the destination It is possible to save energy that can be reached in a limited amount of time and wasted in a congested state, and to suppress greenhouse gas emissions.

Furthermore, even when the vehicle is stopped, the appropriate distance is maintained, so emergency vehicles such as ambulances, fire engines and patrol cars can sew between the distances whenever necessary. , Lifesaving, quick fire extinguishment, early resolution of incidents.
In addition, since an appropriate inter-vehicle distance is maintained even when the vehicle is stopped, an effect of greatly reducing a ball collision collision can be expected.

FIG. 1 is a diagram for explaining the operation of the present invention. Example 1 FIG. 2 is an apparatus configuration diagram of the present invention. Example 1 FIG. 3 is a flowchart of the front apparatus of the present invention. Example 1 FIG. 4 is a diagram for explaining the operation of the present invention. (Example 2) FIG. 5 is an apparatus configuration diagram of the present invention. (Example 2) FIG. 6 is a flowchart of the front apparatus of the present invention. (Example 2) FIG. 7 is a diagram for explaining the operation of the present invention. Example 3 FIG. 8 is a configuration diagram of the front device of the present invention. Example 3 FIG. 9 is a rear view of the present invention. Example 3 FIG. 10 is a flowchart of the front apparatus of the present invention. Example 3 FIG. 11 is a flowchart of the rear device of the present invention. Example 3 FIG. 12 is a diagram for explaining the operation of the present invention. (Example 4) FIG. 13 is a configuration diagram of the front device of the present invention. (Example 4) FIG. 14 is a rear device configuration diagram of the present invention. (Example 4) FIG. 15 is a flowchart of the front apparatus of the present invention. (Example 4) FIG. 16 is a flowchart of the rear device of the present invention. (Example 4)

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

FIG. 1 is a diagram for explaining the operation of the first embodiment of the present invention.
An inter-vehicle distance measuring device 3 provided at the front portion of the car 1 measures the inter-vehicle distance between the car 1 and the car 2 running ahead. For the measuring device, a millimeter wave radar or the like that is not easily affected by the distance measurement result even in weather conditions is used.

  The distance between the car 1 and the car 2 is more than a predetermined distance set based on the acceleration performance of the car 1 (Fig. 1.a). When the vehicle 2 decelerates due to an abnormality in the road conditions ahead, the undecelerated vehicle 1 approaches the vehicle 2. When the measuring device 3 detects that it has approached a predetermined distance set in advance, the determination device 4 operates the alarm device 5 of the car 1 running behind (FIG. 1.b).

  As a result, the driver of the vehicle 1 decelerates or stops based on the education received in advance, while decelerating according to this warning and maintaining the inter-vehicle distance so that the distance between the vehicle 1 and the vehicle 2 is not further reduced. it can. In this way, the warning indicates that the inter-vehicle distance is not reduced even when the vehicle is decelerated or stopped. Since the inter-vehicle distance is maintained, it is possible to start running without delay when restarting, and avoid a traffic jam.

  It is better to add an alarm sound to the alarm device to enhance the alarm effect. There is no need to display an alarm only for an alarm sound.

  By using the present invention for all the vehicles in a column, accumulation of delay time at the time of starting can be avoided, so that a so-called congestion state can be suppressed.

  FIG. 2 is an apparatus configuration diagram, and FIG. 3 is a flowchart from distance detection to alarm start.

FIG. 4 is an operation explanatory diagram of the second embodiment of the present invention.
An inter-vehicle distance measuring device 3 provided at the front portion of the car 1 measures the inter-vehicle distance between the car 1 and the car 2 running ahead. For the measuring device, a millimeter wave radar or the like that is not easily affected by the distance measurement result even in weather conditions is used.

  The distance between the car 1 and the car 2 is more than a predetermined distance set based on the acceleration performance of the car 1 (Fig. 4.a). When the vehicle 2 decelerates due to an abnormality in the road conditions ahead, the undecelerated vehicle 1 approaches the vehicle 2. When the measuring device 3 detects that a predetermined distance has been approached, the determination device 4 causes the alarm device 5 of the car 1 to issue a first-stage alarm (FIG. 4.b). Since attention is urged before reaching a predetermined fixed distance, the driver of the vehicle 1 is given time margin for decelerating and can avoid dangerous sudden driving operation.

  As a result, the driver of the car 1 starts the operation from the first stage based on the education received in advance, so that the speed can be adjusted more smoothly than in the first embodiment. In addition, it is possible to confirm that the fixed distance to be maintained between the vehicle 1 and the vehicle 2 can be secured again by returning to the first state of caution by the deceleration operation.

  In this way, the warning indicates that the inter-vehicle distance is not reduced even during deceleration or stopping. Since the inter-vehicle distance is maintained, it is possible to start running without delay when restarting, and avoid a traffic jam.

  It is better to increase the alarm effect by adding an alarm sound whose volume and tone are changed in the first stage and the second stage to the alarm device. Instead of changing the alarm display, it may be possible to change only the volume and tone of the alarm sound step by step.

  By using the present invention for all the vehicles in a column, accumulation of delay time at the time of starting can be avoided, so that a so-called congestion state can be suppressed.

  FIG. 5 is an apparatus configuration diagram, and FIG. 6 is a flowchart from distance detection to alarm start.

FIG. 7 is a diagram for explaining the operation of the third embodiment of the present invention.
An inter-vehicle distance measuring device 3 provided at the front portion of the car 1 measures the inter-vehicle distance between the car 1 and the car 2 running ahead. For the measuring device, a millimeter wave radar or the like that is not easily affected by the distance measurement result even in weather conditions is used.

  The distance between the car 1 and the car 2 is more than a predetermined distance set based on the acceleration performance of the car 1 (Fig. 7.a). When the vehicle 2 decelerates due to an abnormality in the road conditions ahead, the undecelerated vehicle 1 approaches the vehicle 2. When the measuring device 3 detects that the predetermined distance has been approached, the determination device 4 operates the alarm device 5 of the car 1 running behind (FIG. 7.b).

  As a result, the driver of the vehicle 1 decelerates or stops based on the education received in advance, while decelerating according to this warning and maintaining the inter-vehicle distance so that the distance between the vehicle 1 and the vehicle 2 is not further reduced. it can. In this way, the warning indicates that the inter-vehicle distance is not reduced even during deceleration or stopping. Since the inter-vehicle distance is maintained, it is possible to start running without delay when restarting, and avoid a traffic jam.

  It is better to add an alarm sound to the alarm device to enhance the alarm effect. There is no need to display an alarm only for an alarm sound.

  Furthermore, the inter-vehicle distance measuring device 7 provided at the rear of the car 1 measures the inter-vehicle distance between the car 1 and the car 6 running behind (FIG. 7.c). Hereinafter, the determination device 8 operates the alarm device 9 of the vehicle 1 in the same manner as the measurement of the distance between the rear vehicle, determination, and alarm (FIG. This is an alarm display that can be distinguished from the lighting of the brake lamp by the brake operation of the car 1, and this is performed for the car 6 behind.

  As a result, the driver of the vehicle 6 behind the vehicle decelerates according to the warning based on the education received in advance and keeps the distance between the vehicles 1 and 2 so that the distance between the vehicles 1 and 2 is not further reduced. Or you can stop. In this way, the warning indicates that the inter-vehicle distance is not reduced even during deceleration or stopping. Since the inter-vehicle distance is maintained, it is possible to start running without delay when restarting, and avoid a traffic jam.

  By using the present invention for all the vehicles in a column, accumulation of delay time at the time of starting can be avoided, so that a so-called congestion state can be suppressed.

  8 is a configuration diagram of the front device, FIG. 9 is a configuration diagram of the rear device, FIG. 10 is a flowchart of the front device from distance detection to alarm start, and FIG. 11 is a flowchart of the rear device from distance detection to alarm start. .

FIG. 11 is a diagram for explaining the operation of the fourth embodiment of the present invention.
An inter-vehicle distance measuring device 3 provided at the front portion of the car 1 measures the inter-vehicle distance between the car 1 and the car 2 running ahead. For the measuring device, a millimeter wave radar or the like that is not easily affected by the distance measurement result even in weather conditions is used.

  The distance between the car 1 and the car 2 is more than a predetermined distance set based on the acceleration performance of the car 1 (Fig. 10.a). When the vehicle 2 decelerates due to an abnormality in the road conditions ahead, the undecelerated vehicle 1 approaches the vehicle 2. When the measuring device 3 detects that the predetermined distance has been approached, the determination device 4 causes the alarm device 5 of the car 1 to issue a first-stage alarm (FIG. 10.b). The reason why attention is urged before reaching a predetermined constant distance is to give the vehicle 1 time to decelerate and to avoid dangerous sudden driving operations.

  If the measurement device 3 detects that the distance between the vehicle 2 and the vehicle 2 is still smaller and is less than or equal to a predetermined distance, the determination device 4 activates the second-stage alarm to the alarm device 5 of the car 1. (Fig. 10.c).

  As a result, the driver of the car 1 starts the operation from the first stage based on the education received in advance, so that the speed can be adjusted more smoothly than in the first embodiment. Moreover, it can confirm that the fixed distance which the vehicle 1 should keep between the vehicles 2 was able to be ensured again by returning to the attention state of a 1st step.

  In this way, the warning indicates that the inter-vehicle distance is not reduced even during deceleration or stopping. Since the inter-vehicle distance is maintained, it is possible to start running without delay when restarting, and avoid a traffic jam.

  It is better to increase the alarm effect by adding an alarm sound whose volume and tone are changed in the first stage and the second stage to the alarm device. Instead of changing the alarm display, it may be possible to change only the volume and tone of the alarm sound step by step.

  Furthermore, the inter-vehicle distance measuring device 7 provided at the rear part of the vehicle 1 measures the inter-vehicle distance between the vehicle 1 and the vehicle 6 running behind. Thereafter, the determination device 8 causes the alarm device 9 of the car 1 to issue a first-stage alarm in the same manner as the measurement of the inter-vehicle distance with the preceding vehicle, determination, and alarm (FIG. 10.d). It should be a yellow light or blink that shows the traffic light and indicates the meaning of the attention. The reason for calling attention before reaching a preset fixed distance is to give the subsequent vehicle 6 time to decelerate.

  If the measuring device 7 still detects that the distance between the vehicle 6 and the vehicle 6 is further reduced and is equal to or less than a preset fixed distance, the determination device 8 issues a second-stage alarm to the rear alarm device 9 of the vehicle 1. Operate (Figure 10.e). It is also desirable to follow traffic signals and turn on or flash red.

  As a result, the driver of the rear vehicle 6 starts the operation from the yellow attention stage based on the education received in advance, so that the speed can be adjusted more smoothly than in the first embodiment. Moreover, it can confirm that the fixed distance which the vehicle 2 should keep between the vehicles 1 was able to be ensured again by returning to the state of yellow attention.

  In this way, the warning indicates that the inter-vehicle distance is not reduced even during deceleration or stopping. Since the inter-vehicle distance is maintained, the vehicle 6 can also start running without delay when restarting.

  By using the present invention for all the vehicles in a column, accumulation of delay time at the time of starting can be avoided, so that a so-called congestion state can be suppressed.

  FIG. 12 is a front device configuration diagram, FIG. 13 is a rear device configuration diagram, FIG. 14 is a flowchart diagram of the front device from distance detection to alarm start, and FIG. 15 is a flowchart of the rear device from distance detection to alarm start. .

  Since traffic congestion is minimized, land traffic is made more efficient, energy consumption is reduced, emergency transport can be carried out smoothly, and ball collisions can be reduced.

DESCRIPTION OF SYMBOLS 1 Car which installs this apparatus 2 Car which runs ahead 3 Car distance measuring device 4 The judgment device which memorized appropriate front distance between vehicles 5 Own vehicle alarm display / alarm sound generator 6 Car which runs behind 7 Back Measuring device for distance to other cars 8 Judgment device that stores the appropriate distance behind the vehicle 9 Rear warning display device

Claims (4)

  A distance measuring device that can measure the distance between the vehicle in front and the measurement result of this distance measuring device, compared with the value held in advance according to the acceleration performance of the own vehicle, It consists of a determination device that can determine that the distance has narrowed more than a certain amount and start the operation of the alarm device, and an alarm device that issues an alarm to the driver. A traffic jam suppression assisting device that allows a driver to maintain a distance between vehicles even at low speeds and when the vehicle is stopped.   A distance measuring device that can measure the distance between the vehicle in front and the measurement result of this distance measuring device, compared with the value held in advance according to the acceleration performance of the own vehicle, Judgment device that can start the operation of the alarm device by determining that the distance has narrowed more than a certain amount, and the driver first displays a warning alert before the inter-vehicle distance reaches a certain value, and further reduces the distance and makes it constant It consists of a two-stage alarm device that gives a stronger warning when the value is exceeded, and this alarm is also issued at low speeds and when the vehicle is stopped, allowing the driver to maintain the inter-vehicle distance even at low speeds and when the vehicle is stopped A traffic jam prevention assist device characterized by that.   In addition to [Claim 1], a distance measuring device that can measure the distance between the following vehicles and the measurement result of this distance measuring device are compared with the numerical value that is held in advance according to the acceleration performance of the vehicle. And a determination device that can determine that the distance to the following vehicle has become narrower than a certain distance and start the operation of the alarm device, and an alarm device that issues an alarm to the subsequent vehicle, and can be used at low speeds and when the vehicle stops. A traffic jam suppression assisting device that issues this warning and causes the driver to maintain the inter-vehicle distance even at low speeds and when the vehicle is stopped.   In addition to [Claim 2], a distance measuring device capable of measuring the distance between the following vehicle and the measurement result of this distance measuring device is compared with a numerical value held in advance according to the acceleration performance of the own vehicle. In addition, a determination device that can determine that the distance to the following vehicle has become narrower than a certain value and start the operation of the alarm device, and a warning warning to the driver of the following vehicle before reaching a certain value of the inter-vehicle distance. It is composed of a two-stage alarm device that displays an alarm that indicates a stronger warning when the distance further decreases and exceeds a certain value, and this alarm is also issued at low speeds and when stopped, at low speeds and when stopped A traffic jam prevention assist device characterized by allowing the driver to maintain the inter-vehicle distance.

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