FR3112644A1 - ROAD TRAFFIC SYSTEM - Google Patents

Abstract

SYSTEM FOR ROAD TRAFFIC The system comprises roadside systems (26) with a road sign (3) provided with a mast (4) resting on the roadside ground, and an electrical cabinet (7) fixed on the mast ( 4), a signaling front face (6) of round, triangular, rectangular or square shape. A meteorological station (12) comprises a sensor (13) for repeatedly measuring a meteorological quantity. A traffic detection system includes a sensor (17) for measuring a characteristic of road traffic on the road at the traffic sign (3). A computerized characterization module determines a composite index of meteorological quantity and road traffic from the measured data of meteorological quantity and road traffic characteristic. Figure for abstract: Fig. 2

Description

SYSTEM FOR ROAD TRAFFIC

FIELD OF THE INVENTION

The present invention relates to road traffic.

TECHNOLOGICAL BACKGROUND

In the field of road traffic, it is known to see a certain number of vehicles circulating on the roads. For a long time there has been developed a system of road signs. This system includes panels arranged along the roadside, and providing information to road users. These panels meet certain standards. The signaling code used is relatively universal, and is learned and recognized by road users.

In addition, climatic conditions are a factor that has a very strong impact on road traffic. However, a driver's sources of weather information remain very limited. Motor vehicles themselves are equipped with measuring devices, such as a thermometer that measures the ambient temperature, and a humidity sensor on the windshield that can be used to trigger the windshield wipers. On the other hand, only users equipped with vehicles equipped in this way can benefit from this information.

For the rest, users will generally be satisfied with macroscopic meteorological information, such as that provided during a national or regional meteorological bulletin broadcast by a medium, for example television, and therefore very macroscopic, relative to the scale of the journey. road carried out.

WO 2017/037.379 describes a road sign provided with a rain sensor, so as to control the display of the road sign. If the legislation imposes, on certain roads, a speed limit which depends on the weather conditions, the sign of the tens of the number displayed on the panel, corresponding to the maximum authorized speed, can be modified according to the rain sensor.

This panel can also be linked to a web server for supervision.

Thus, the invention relates to a system comprising:
- at least one, and in particular, a plurality of roadside systems, each roadside system comprising:
. a road sign provided with a mast resting on the ground at the edge of the road, and an electrical cabinet fixed to the mast, and comprising a front signaling face of round, triangular, rectangular or square shape,
. a meteorological station comprising at least one sensor suitable for repeatedly measuring a meteorological quantity, and an electronic box housed in the electrical cabinet,
. a traffic detection system comprising at least one sensor adapted to measure a characteristic of the road traffic on the road at the level of the road sign, and an electronic box housed in the cabinet,
the system comprising a computerized characterization module adapted to determine a composite index of the meteorological quantity and of the road traffic from the measured data of meteorological quantity and road traffic characteristic.

Thanks to these arrangements, entirely new elaborated data are available, which are useful in a large number of applications for road traffic assistance.

Depending on various aspects, it is possible to provide one and/or the other of the provisions below.

According to one embodiment, the roadside system comprises a controller comprising the computerized characterization module.

According to one embodiment, the roadside system further comprises a communication system adapted to communicate with a remote device.

According to one embodiment, the communication system is adapted to communicate with another roadside system and/or a motor vehicle.

According to one embodiment, the system comprises a remote server, the communication system is adapted to communicate with the remote server, and the remote server comprises the computerized characterization module.

According to one embodiment, the computerized characterization module is adapted to determine a composite index of the meteorological quantity, of the road traffic and of the location of the roadside system from the measured data of meteorological quantity, of road traffic characteristic, and a location of the roadside system.

According to one embodiment, the computerized characterization module also takes into account measured data of meteorological magnitude and road traffic characteristic, or even location, coming from at least one other roadside system.

Embodiments of the invention will be described below with reference to the drawings, briefly described below:

schematically represents a road for automobile traffic, seen from a motor vehicle traveling on this road.

is a partial side view of a roadside system usable according to one embodiment of the invention.

is a representative diagram of an electronic system used at a roadside system.

is a front view of a roadside system according to a second embodiment.

is a schematic view of a traffic assistance system.

In the drawings, identical references designate identical or similar objects.

DETAILED DESCRIPTION

Figure 1 schematically represents a road 1. To fix the ideas, the invention is presented in the context of a traffic direction on the right. However, the invention would be just as applicable for a direction of traffic on the left. Route 1 is for example a paved road.

The road is delimited, on the right side, by a road edge 2, which can be of any suitable nature, for example in earth (case of the countryside) or in synthetic material (concrete, etc… - case of cities). Typically, roadside 2 is unsuitable for road traffic.

A road sign 3 is fixed on the side of the road. Road sign 3 complies with the regulations in force, i.e. for France, in accordance with the decree of 24 November 1967 on road signs (modified by successive decrees) and the interministerial instruction on road signs, conforming to the standard and marked "CE", which is equivalent to approval for road signaling equipment on the priority date of the patent application. The sign may comply with other regulations, depending on the territory and the date of implementation of the invention.

In the example shown, the signaling panel 3 comprises an elongated vertical mast 4 fixed to the ground in any appropriate manner, and a signaling device 5. The signaling device 5 is fixed to the mast at a sufficient height, even standardized, to be visible to road users in normal traffic conditions.

To fix the ideas, one designates by Z the vertical direction, and by X the horizontal direction of the road at the level of the road sign 3. The Y direction completes the orthonormal X-Y-Z coordinate system.

The signaling device 5 comprises a signaling face 6, called "front", which faces the road, that is to say which is visible to a road user, rolling in the direction of traffic X, and advancing in the direction of the traffic sign 3. The traffic sign face has a signage corresponding to a road sign. This signage is characterized by a shape of the signage face, seen in the X direction. This shape can be circular, in the example presented, or, as a variant, square (commonly called a "diamond" because of its position oriented at 45 °, but in reality a square according to the geometric definition of this one), rectangular, triangular, even octagonal. In the example shown, the front panel has signage which is understood by any road user as a maximum authorized speed limit of 80 kilometers per hour (km/h).

Figure 2 shows from the side a portion of the signaling panel 3 at the level of the signaling device 5. The signaling panel 3 comprises an electrical cabinet 7, which is concealed behind the signaling face 6.

The electrical cabinet is substantially watertight, under normal conditions of use, which allows it to house electrical components. It can be opened for maintenance by a qualified operator equipped with suitable tools.

The system includes a power supply.

According to an exemplary embodiment, provision is made for the rear face 8 of the electrical cabinet 7 to carry one or more photovoltaic panels 9 suitable for capturing sunlight (or public lighting) and converting it into electricity supplying a battery 10 disposed in the electrical cabinet 7. As a variant or in addition, the battery 10 can be powered by a wired electrical network connected to which the signaling panel 3 is connected. Alternatively, the battery 10 cannot be charged with energy in the signaling panel 3. It is replaced periodically during a maintenance operation.

The battery 10 supplies energy to a controller 11, processor or other programmable electronic machine placed inside the electrical cabinet 7.

The system also includes a meteorological station 12. The meteorological station 12 includes at least one sensor 13 adapted to make a meteorological measurement, and a processor. As sensor 13, one can for example consider a thermometer, which measures an ambient temperature. The thermometer is for example arranged inside the electrical cabinet 7. Alternatively, the thermometer protrudes outside the electrical cabinet 7, so as to measure the temperature of the ambient air. As a further variant, the sensor 13 can be arranged entirely outside the electrical cabinet 7. For example, the sensor 13 can be arranged in a box 32 fixed at the upper end of the mast 4. As sensor 13, it is also possible to envisage a humidity or rain sensor. As sensor 13, it is also possible to envisage an optical sensor, a barometer, a weather vane (detection of the direction of the wind) or an anemometer. As a variant or in addition, one can use a sensor 13 implanted in the roadway, flush with the surface near the road sign 3, and connected to the electrical cabinet 7 for example by wire. The meteorological data measured may thus include one and/or other of the following data: humidity level in the air, wind speed, wind direction, visibility, dew point temperature, road surface temperature , freezing point temperature, height of the film of water on the road or depth of snow on the road, type of precipitation, quantity of precipitation, level of humidity of the road, … In particular, a characterization of the road grip and/or visibility characterization. The processor of the weather station is, schematically, integrated into the controller 11. Thus, the reference to the controller 11 is a generic reference designating all the electronic boxes for controlling or controlling the various electronic equipment of the system.

The sensor 13 is connected to the controller 11 in any suitable way, for example wired or wirelessly. If the sensor 13 is outside, or partially outside, the electrical cabinet 7, it is connected, in particular by wire, to the controller 11, through the enclosure of the electrical cabinet 7 in a sealed manner.

The electrical cabinet 7 also houses a clock 15 which makes it possible to timestamp certain events.

The electrical cabinet 7 also houses a memory 14 in which various data are stored, in particular data relating to measurements carried out by the sensors 13, and clock data.

The electrical cabinet 7 also houses a communication system 16 with the outside. In the example presented, the communication system 16 is a wireless communication system. However, as a variant, a wired communication system can be provided in certain places, in particular if the signaling panel 3 is connected for its power supply.

The system also includes a traffic detection system. The traffic detection system comprises a traffic sensor 17 connected to the controller 11. The traffic sensor 17 is suitable for detecting information relating to road traffic at the level of the road sign 3. Information relating to road traffic may comprise the absence or presence of a motor vehicle within the detection range of the traffic sensor 17. Alternatively, the information may comprise an instantaneous speed of movement of the detected motor vehicle.

The traffic sensor 17 can be based on a radio or optical wave detection technology propagating in the air, and disturbed, for example reflected, by a motor vehicle, for example by a metallic mass. The traffic sensor 17 can for example be arranged inside the electrical cabinet 7, and oriented towards the road, the material constituting the signaling face 3 being transparent to the waves emitted by this sensor as reflected by the vehicle.

Alternatively or in addition, as shown in Figure 4, the traffic sensor 17 may include a probe integrated into the road surface 19, and flush with the surface near the traffic panel 3, and connected thereto by wire. . Such a traffic sensor can, for example, carry out vehicle or axle counting. Such a traffic sensor can be integrated into the roadway with minimal installation work.

If necessary, a pavement module is thus available that is embedded in the pavement, and comprises both a weather station sensor 13 and a traffic measurement probe. The roadway module is connected to the signaling panel 3 by wire for its energy supply and/or communication. As a variant, the roadway module could communicate with the electrical cabinet 7 wirelessly, and be supplied with energy independently.

It will be noted that, independently of the construction of the traffic sensor 17, FIG. 4 also represents a traffic sign according to an alternative embodiment, in which the signaling face 6 is equipped with electronic signaling devices 20. Indeed, due to the presence near the signaling face, of a battery 10 and of a controller 11, it is possible to supply energy and to control electronic signaling devices 20. According to this example, the electronic signaling devices 20 potentially include light-emitting diodes whose activation is controlled by the controller 11. For example, these light-emitting diodes are arranged at specific locations, on one or more colored parts of the signaling face 6. However, even in this embodiment, the traffic sign remains a traffic sign in the direction of the road, as defined above. Thus, the invention does not target devices equipped with screens which would have a purely informative function, but which do not comply with the regulations as defined above.

According to one embodiment, a measurement by the meteorological station 12 is carried out periodically. The periodicity may depend on the quantity measured. In addition, the periodicity can be variable depending on the location of panel 3 (a panel 3 placed in a location requiring precise monitoring of weather conditions (for example on a bridge or a work of art) can be configured with higher measurement frequency). As a variant or in addition, the periodicity of the measurement may depend on the meteorological conditions. For example, if the detected temperature is close to freezing point, measurements can be made more often than when the temperature is far from freezing point.

According to one embodiment, the controller 11 comprises a computerized characterization module 21 suitable for determining a composite index of a meteorological quantity and of road traffic from the measured data of meteorological quantity and road traffic characteristic.

The composite index of meteorological size and road traffic is an index determined on the basis of detected meteorological data and detected road traffic data.

According to one example, the composite index is a Boolean index determined from a Boolean index relating to traffic and a Boolean index relating to meteorology.

In this example, the boolean index relating to traffic can be the presence of traffic.

The Boolean index relating to the meteorology can be the detection of a meteorological characteristic value greater than a certain threshold, for example, a detection of rain during a past period of a predetermined duration, for example one hour.

• La valeur « 1 » en cas de présence de trafic détectée et de détection de pluie pendant une durée inférieure à une heure avant l’instant actuel,
• La valeur « 0 » sinon.

Therefore, in this example, the composite index of weather and road traffic magnitude can take:

• The value "1" in the event of the presence of detected traffic and detection of rain for a period of less than one hour before the current instant,
• The value “0” otherwise.

According to another embodiment, the Boolean index relating to traffic can be the determination of an instantaneous speed of a vehicle greater than a predetermined threshold.

• La valeur « 1 » en cas de présence de trafic détectée à une vitesse instantanée supérieure au seuil prédéterminé et de détection de pluie pendant une durée inférieure à une heure avant l’instant actuel,
• La valeur « 0 » sinon.

In this example, the composite index of meteorological magnitude and road traffic can take:

• The value "1" in the event of the presence of traffic detected at an instantaneous speed greater than the predetermined threshold and detection of rain for a period of less than one hour before the current instant,
• The value “0” otherwise.

• En cas de détection de pluie positive pendant une durée inférieure à une heure avant l’instant actuel :
  • La valeur « 1 » en cas de présence de trafic détectée à une vitesse instantanée supérieure à un premier seuil prédéterminé,
• En cas de détection de pluie négative pendant une durée inférieure à une heure avant l’instant actuel :
  • La valeur « 1 » en cas de présence de trafic détectée à une vitesse instantanée supérieure à un deuxième seuil prédéterminé (typiquement supérieur au premier seuil prédéterminé),
• La valeur « 0 » sinon.

According to yet another example, the predetermined threshold for the instantaneous speed can depend on meteorological data. In this example, the composite index of meteorological magnitude and road traffic can take:

• In case of positive rain detection for less than one hour before the current time:
  • The value "1" in the event of the presence of traffic detected at an instantaneous speed greater than a first predetermined threshold,
• If negative rain is detected for less than one hour before the current time:
  • The value "1" in the event of the presence of traffic detected at an instantaneous speed greater than a second predetermined threshold (typically greater than the first predetermined threshold),
• The value “0” otherwise.

As a further variant, the predetermined duration may be different for the determination of the speed threshold and for the determination of the value “1” or “0” for the composite index, once the scenario chosen which depends on the first predetermined duration.

The above descriptions are simple examples, but other examples are possible which involve road traffic data and meteorological data, and determine a composite index from these data.

In the example of FIG. 4, the controller 11 can control the electronic signaling devices 20 according to the determined composite index.

The term "roadside system" 26 refers to the system arranged on the side of the road, comprising the roadside panel 3 and the electrical cabinet 7 comprising the various electronic components described above. The integration of the electrical cabinet in the road sign makes it possible to measure information in the immediate vicinity of the road, and therefore relevant information relating to the road. A compact device can be made. For example, the constituent material of the panel and/or the electrical cabinet is a suitable plastic, for example an acrylonitrile butadiene styrene.

The roadside system 26 may also include other electronic components, such as, for example, an anti-theft device, an anti-intrusion alarm, a motion detector, a shock detector, an accelerometer or a location beacon (putting implements for example a satellite detection technology sometimes designated by the English acronym "GPS" for "Ground positioning system") detecting an unforeseen movement of the sign 3, for example in the event of break-in, theft or impact . A camera may also be provided to take an image which may be used to determine the cause of an alert.

According to another example, as shown in Figure 5, the system further comprises a remote server 22. The remote server 22 comprises at least one processor 23 adapted to process data, a memory 24 adapted to store data, and a system communication 25 adapted to communicate with the communication system 16 of the roadside system. The communication system 25 is for example adapted to communicate wirelessly with the communication systems 16 of roadside systems equipped with wireless communication, and wiredly with the communication systems 16 of roadside systems. road equipped with wired communication. The remote server 22 can thus at least collect information relating to the correct operation of the roadside system 16, for example in particular in the event of detection of suspicious movement.

According to the embodiment of Figure 5, two roadside systems are shown. These two roadside systems are designated, respectively, by the references 26a and 26b. This embodiment can be used for a larger number of roadside systems, for example three roadside systems, ten roadside systems, even a thousand roadside systems. In a purely illustrative manner, FIG. 5 shows a first roadside system 26a as described above according to a first embodiment of FIG. 1, and a second roadside system 26b as described above. above according to a second embodiment of Figure 4. However, other embodiments are possible.

Each roadside system 26 communicates with the remote server 22 via their communication systems 16 and 25. An identifier is associated with each roadside system 26, so as to associate the communications with each onboard system. 26. The remote server 22 thus collects composite indices associated with each roadside system 26.

In one aspect, a geographic location is known for each roadside system 26 (eg, by regular communication from the positioning beacon). The remote server 22 can thus associate a composite index of the meteorological magnitude and of the road traffic with a location. This location is for example entered in the memory of the remote server 22, and associated with the identifier of the roadside system, when the roadside system is put into service.

The remote server is thus able to generate a composite index of weather magnitude, road traffic and location.

This processing can be performed, for example, for a single roadside system 26.

Alternatively, this processing may be performed for a plurality of roadside systems.

According to a particular embodiment, a road map of the region in which the roadside systems are installed is available.

Thus, the location of roadside systems can be, alternatively or in addition to an absolute location (of the ground positioning type), a location interpreted or relative to road mapping. According to examples, various road objects can be identified, such as for example a road, a half-road (that is to say in a single direction of traffic for a road with two traffic directions), a road section, a route, a particular location (dangerous bend, crossroads, access ramp, toll, entrance to agglomeration, etc.). Each road object can be associated with an identifier.

From the composite indices of the meteorological quantity and the road traffic associated with each roadside system associated with an interpreted location, it is possible to determine a composite index of the meteorological quantity, the road traffic and the location.

According to one example, the processor 23 identifies a blockage in access ramp No. 0163D to the motorway, associated with a risk of ice in this access ramp.

The server 22 can be connected to a man-machine interface 27. The man-machine interface 27 makes it possible to present a composite index of the meteorological magnitude, the road traffic and the location to an operator. The man-machine interface 27 can include several devices, such as one or more displays, indicator lights or audible warning devices relating to alarms, etc. In addition, the man-machine interface 27 can allow an operator to communicate with the server 22, for example requesting more information relating to the location concerned, or to surrounding locations. The man-machine interface 27 can make it possible to trigger several operations such as, for example, the dispatch of relief, of a police patrol, of a maintenance team, etc.

According to another example, provision is made for the server 22 to include an interface module 28 intended to transmit relevant information to the vehicles. This requires that a vehicle 29 be equipped with a communication module 30 allowing it to receive information, and a geolocation system 31 allowing the location of the vehicle 29 to be determined. Depending on the location of the vehicle 29, determined by the geolocation system 31, the vehicle can receive, via its communication module 30, a composite index of the meteorological quantity and of the road traffic relevant to the location of the vehicle. The composite index in question is not necessarily that of the location of the vehicle, but may relate to a location downstream of the vehicle along a route followed by it. Thus, if a future location of the vehicle is known, or at least predicted, the vehicle can receive, via its communication module 30, a composite index of the meteorological magnitude and of the road traffic at this future location.

This system fitted to the vehicle can be integrated into the vehicle, or a removable system such as, for example, a removable navigation box or even a smartphone, generally designated by the Anglicism "smartphone", of the driver or a passenger.

According to the previous example, the roadside system 26 is adapted to determine a composite index of the meteorological quantity and the road traffic, and to transmit this composite index to the server 22 for further processing.

Alternatively, it would be possible for the composite index of the weather quantity and road traffic associated with a roadside system 26 to be determined by the processor 23 of the server 22. In this case, the roadside systems 26 transmit the measured data to the processor 23, and the processor 23 determines the composite index of the weather quantity and the road traffic associated with each roadside system. According to this variant, in addition, the processor 23 is able to determine other composite indices, for example a composite index of the meteorological quantity and the location, and/or a composite index of the road traffic and the location from one or more roadside systems 26.

The communication between the roadside system 26 and the remote server 22 may also concern the maintenance of the roadside system. The latter communicates to the server 22 information relating to its operation, technical faults (battery, photovoltaic panel, etc.) or alerts. The server 22 can also communicate to the roadside systems 26 information or updates.

The server 22 can communicate to the roadside system 26 the identified composite index corresponding to the data detected by the roadside system in question. For example, if the roadside system 26 is provided with operable signaling means, as in the example of FIG. 4 above, these actuable signaling means are actuated according to the composite index received.

According to yet another embodiment, the server 22 can communicate information determined from the composite index to several roadside systems 26. This will be the case for example if these belong to a predetermined road object. If, for example, the server 22 determines a risk in a road section, information can be sent to one or more roadside systems 26 upstream of this section. This arrangement is particularly suitable for signaling devices which are associated with the same road event: typically, an announcement signaling device which warns the road user of the imminence of a road event, then a signage at the site of the actual road incident. For example, for a dangerous bend, it is not uncommon to have, upstream, a signaling device relating to the dangerous bend, a signaling device which alerts, a few hundred meters earlier, of the imminence of the dangerous bend. Thus, in the event that a relevant composite index was determined for the location of the downstream roadside system, this information could be communicated to the upstream roadside system, even if, for this one, no particular composite index should be noted.

According to yet another embodiment, provision may be made for roadside systems close to each other to communicate with each other as an alternative or in addition to communication with the remote server 22. Thus, a processor 11 of a roadside system 26a is adapted to determine a composite index of the meteorological quantity and of the road traffic on the basis, in addition, of data relating to the meteorological quantity and/or of the road traffic coming from a another neighboring roadside system 26b, the identity of which is known by the roadside system 26a, even the relative location, even several of these neighboring roadside systems 26b.

For example, on a crossroads, or on a stretch of road comprising several roadside systems, it is possible to locally determine a composite index of the meteorological magnitude and of road traffic from data coming from a limited number of onboard systems. of road.

According to yet another embodiment, the roadside system 26 is adapted to communicate directly with a vehicle 29 passing nearby. This requires that the communication system 16 be adapted to communicate with the communication module 30 of the vehicle. If the vehicle communicates information to the roadside system 26, this information can be used as information relating to road traffic. This information may include a vehicle identifier, instantaneous information relating to the vehicle and/or its occupants, such as for example an instantaneous speed determined by the on-board recorder, a destination entered in a navigation device of the vehicle, a provenance, a number of occupants, etc., but also information relating to the weather, such as, for example, temperature or rain detection data recorded by the on-board computer.

If the roadside system 26 communicates information to the vehicle, this may at least include information relating to traffic, such as for example a number of vehicles having recently passed through the roadside system, and/or Meteorology. Whether received from the roadside system 26 or from the server 22, this information can be used by the vehicle's on-board computer for driving assistance, or even for driving an autonomous vehicle.

Although the invention has been presented above with reference to a roadside system 26 comprising a mast, it can also be used with roadside systems without masts, fixed for example on a guardrail or another object close to the road.

References

Route 1
Roadside 2
Road sign 3
Mate 4
Signaling device 5
Sign face 6
Electrical cabinet 7
Rear side 8
Photovoltaic panel 9
Battery 10
Controller 11
Weather station 12
Sensor 13
Memory 14
Clock 15
Communication system 16
Traffic Sensor 17
Road surface 19
electronic signaling devices 20
computerized characterization module 21
Remote Server 22
Processor 23
Memory 24
Communication system 25
Roadside System 26
Man-machine interface 27
Interface module 28
Vehicle 29
communication module 30
geolocation system 31
casing 32

Claims (7)

System comprising:
- at least one, and in particular, a plurality of roadside systems (26), each roadside system comprising:
. a road sign (3) provided with a mast (4) resting on the roadside ground, and an electrical cabinet (7) fixed to the mast (4), and comprising a signaling front face (6) round, triangular, rectangular or square,
. a meteorological station (12) comprising at least one sensor (13) suitable for repeatedly measuring a meteorological magnitude, and an electronic box housed in the electrical cabinet (7),
. a traffic detection system comprising at least one sensor (17) suitable for measuring a characteristic of road traffic on the road at the level of the road sign (3), and an electronic box housed in the cabinet,
the system comprising a computerized characterization module (21) adapted to determine a composite index of the meteorological quantity and of the road traffic from the measured data of the meteorological quantity and of the road traffic characteristic. A system according to claim 1, wherein the roadside system (26) comprises a controller (11) comprising the computerized characterization module (21). A system according to claim 1 or 2, wherein the roadside system further comprises a communication system (16) adapted to communicate with a remote device. A system according to claim 3, wherein the communication system (16) is adapted to communicate with another roadside system (26) and/or a motor vehicle (29). System according to claim 3 or 4, comprising a remote server (22), in which the communication system (16) is adapted to communicate with the remote server (22), and in which the remote server (22) comprises the computerized module characterization (21). System according to one of Claims 1 to 5, in which the computerized characterization module (21) is adapted to determine a composite index of the meteorological quantity, the road traffic and the location of the roadside system from the data measured weather magnitude, road traffic characteristic, and location of the roadside system (26). System according to one of Claims 1 to 6, in which the computerized characterization module (21) also takes into account measured data of meteorological magnitude and road traffic characteristic, or even location, coming from at least one another roadside system (26).