FR2787228A1 - System for warning drivers accessing dual carriageways and motorways in the wrong sense, comprises optical warning, physical non harmful barrier, photography and oncoming driver warning - Google Patents

Abstract

A driver accessing a dual carriageway or motorway in the wrong sense receives a luminous optical warning and if he does not slow down is presented with a non harmful retractable physical barrier consisting of thin strips (4). Drivers proceeding in the correct direction are warned and a camera (5) identifies the time, date and errant vehicle for the information of the police

Description

The present invention relates to a preventive device with respect to

  the opposite of access to 2 x 2 lane roads or motorways.

  The equipment must inform the driver that his vehicle is traveling in the wrong direction of traffic. It is located on roadsides or on access roads for example 50 meters from the fork - see Figure 4. It works

  night and day whatever the weather conditions.

  This device detects vehicles traveling in the wrong direction on access roads of 2 x 2 lane roads or motorways. When detection is

  effective, the device implements means of progressive information towards the driver 0 in the form of a light panel then of an extendable barrier across the roadway.

  Additional information is provided to drivers taking the exit lane in the right direction in order to avoid an accident as well as

  to the police force to facilitate their intervention.

  At present, the number of conductors traveling in the opposite direction is increasing, despite the infrastructure works carried out, due in particular to the increase in the age of the conductors. The services do not know the entry points and need a non-coercive and easy-to-install informative security means on the roadsides. The device can be installed quickly at low cost with

  Zo of infrastructure works reduced to a concrete base.

  The device is built around an extendable barrier across the track. This barrier consists of flexible and fluorescent banners, spaced to allow visibility through, and allowing a vehicle to cross it without damage. The detection of a vehicle in the wrong direction is carried out by a radar sensor which identifies the direction of movement of the vehicle and its presence on the access route to be monitored. Successive means of information are then triggered: * an optical signal to the driver is produced by a "SENS" panel

INTIERDIT "bright.

  e a physical signaling materialized by a barrier of fluorescent strips is extended across the roadway, * an upstream signaling informs drivers in the right direction by a suitable light panel like a "STO'P" for example, * a signaling of the offense in the form of a photograph with the

  35. place, date and time is sent to police for identification.

  jA w iluit -2- For the moment, the only existing systems are passive, made up of road signs. The interest of the system lies in the set of actions initiated in a coordinated and progressive manner. FIG. 1 shows the main functionalities of the device. The detection means (1) which can be used for detecting the direction of traffic are the magnetic loops or the radars. The choice of sensor is oriented towards

  radar to be compatible with use in all weather conditions, especially in foggy weather, allowing installation without earthworks and easy maintenance (compared to a magnetic loop loop). The sensor detects the direction of traffic on one or two lanes in the case of a two-lane exit ramp.

  The diagram fig 2 gives an overview of the device. When a vehicle has been detected in the wrong way on the access lane, the light panel (2) is on and information can be transferred to an upstream-0 signaling device for drivers traveling in the right sounds on the lane. or on the road. Then the trajectory of the vehicle makes it possible to assess whether this vehicle will stop or not:

  in the latter case the barrier (3) will be extended across the road. Ies fluorescent strips (4) thus form a material obstacle but harmless to the vehicle. If the vehicle persists and crosses the barrier then a photograph (5) 2o is taken, with a flash if necessary and transmitted to the police force.

  Figure 3 shows the barrier extension device. A set of deformable parallelograms (6) is propelled then braked by a jack (7): the extension cycle is carried out in about half a second. The propulsion energy is stored in an accumulator (8) and the transmission to the jack is controlled by a solenoid valve (9). The straps are sufficiently spaced about twenty centimeters and thin by a few centimeters to allow vision to

  across the barrier and thus limit the gene for drivers.

  The operating logic is described from the diagram in Figure 5 in the case of the use of a radar sensor whose information concerning the vehicle

  jo arrive in the form of a computer message.

  Test (10): Presence of an approaching vehicle, is carried out by the sole examination of the vehicle speed sign and the verification of the presence of the

  vehicle on the access road. The determination of the trajectory makes it possible to acquire certainty: either on a simple criterion of minimum distance to the device, or on the corellation with the geometry of the access route.

  aiiY1 u -3 - Test (11): the car continues, is carried out from the speed and distance information. This information makes it possible, from filters, to define a trajectory of the

  vehicle in real time and thus decide whether the vehicle will stop or continue.

  Test (12): The car crosses the barrier, is carried out from the previously calculated trajectory. As soon as the calculated trajectory demonstrates the inevitable crossing of the axis of the device, the barrier is removed. The distribution of times for a vehicle traveling at variable speeds from km / h to 70km / h, taken as the maximum speed when taking an access route, shows that the maximum admissible time for the extension of the barrier is d0 of 0.5 seconds: 70km / h corresponds to 20m / s or 3.5 s before the AW - I device, iii -4-

Claims (4)

  1. Preventive device vis-à-vis the taking in the opposite direction of access to roads with 2 x 2 lanes or motorways by non-coercive and progressive information actions characterized in that the device comprises a direction of traffic detection sensors and a set of driver information resources   triggered on demand by the system: optical signals by light panel and then physical signals by an extendable barrier of straps.   2. Device according to claim 1 characterized in that said ao device uses a retractable and extendable barrier on command composed of thin and spaced strips creating a passable obstacle while allowing vision through   3. Device according to claims 1 and 2 characterized in that said device comprises means for transferring information upstream for the   1- 5 drivers in the right direction: on the 2 x 2 lane road or highway   4. Device according to any one of the preceding claims, characterized in that said device comprises means for offset to the   nearest police force to information relating to the vehicle and the offense, for example in the form of a photograph.