Method for securing a vehicle

1. A method for securing a host vehicle traveling in a traveling lane of a road infrastructure comprising at least one lane adjacent to said traveling lane, the securing method comprising for each adjacent lane:

detecting a plurality of vehicles present in the adjacent lane, including an estimate of at least one information item relating to each detected vehicle, including the speed;

determining, with the detected vehicles forming a flow of vehicles, a value representing the speed of the flow in the adjacent lane;

comparing the speed of the host vehicle with the value representing the speed of the flow of vehicles in the adjacent lane;

detecting, when the speed of the host vehicle is greater than the value representing the speed of the flow of vehicles in the adjacent lane by a predetermined threshold, a hazardous situation for the host vehicle; and

sending, to secure the host vehicle, a warning to a driver via a human-machine interface when the hazardous situation is detected.

2. The method as claimed in claim 1 , further comprising, when the hazardous situation is detected, calculating a target speed value for the host vehicle corresponding to the speed of the host vehicle less a quantity that is determined to reduce the risk to the host vehicle.

3. The method as claimed in claim 2 , further comprising:

automatically reducing the speed of the host vehicle to said target speed value of the host vehicle, or

suggesting to the driver of the host vehicle a speed setpoint equal to said target speed value of the host vehicle and, when the driver accepts the suggestion, reducing the speed of the host vehicle to said setpoint value.

4. The method as claimed in claim 1 , in which, for each adjacent lane, the detecting the plurality of vehicles present in the adjacent lane also includes an estimate of the distance between the host vehicle and the detected vehicles.

5. The method as claimed in claim 2 ,

in which, for each adjacent lane, the detecting the plurality of vehicles present in the adjacent lane also includes an estimate of the distance between the host vehicle and the detected vehicles, and

in which the calculating the target speed value for the host vehicle includes determining said quantity as a function of the distance between the host vehicle and the vehicles detected in the adjacent lane.

6. The method as claimed in claim 1 , in which the comparing the speed of the host vehicle with the value representing the speed of the flow of vehicles in the adjacent lane includes said predetermined threshold depending on the speed of the host vehicle.

7. The method as claimed in claim 1 , further comprising changing the traveling lane of the host vehicle in an event of detecting the hazardous situation for the host vehicle.

8. The method as claimed in claim 1 , wherein the value representing the speed of the flow in the adjacent lane is an average speed.

9. A securing device configured to be used in a host vehicle, the securing device comprising:

software and/or hardware elements that are configured to implement the method as claimed in claim 1 .

10. The device as claimed in claim 9 , wherein the software and/or hardware elements comprise:

a detection system configured to detect a plurality of vehicles present in at least one adjacent lane, and to estimate a speed of the detected vehicle;

a processor configured to determine a value representing the speed of the flow of vehicles in the at least one adjacent lane;

a speed arbitration system configured to compare the speed of the host vehicle with the value representing the speed of the flow of vehicles in each adjacent lane, and to calculate a target speed value for the host vehicle corresponding to the speed of the host vehicle less a quantity; and

a human-machine interface configured to issue the warning to the driver of the host vehicle.

11. A vehicle comprising the securing device as claimed in claim 9 .