The importance of observing safer distance to cut the number of road accidents is recognized by the road authorities all over the world. Even if the driver keeps a safe distance from the vehicle ahead, a short-time distracting may lead to collision.
The Mobileye® optical system of vehicle detection provides drivers with the warning of rear-end collision if the car driving at excess speed gets too close to the vehicle ahead.This warning informs the driver of a critical situation, and therefore this can prevent the accident from happening or mitigate its severity.
The feature of forward collision warning (FCW) utilizes the Mobileye optical technologies of vehicle detection and alerts the driver of imminent collisions (within 3 seconds).
Observe perpetually changing conditions on the road;
Interpret the potential for danger;
Alert drivers to initiate action in time to avoid harmful collisions.
Since 2011 the National Highway Safety Traffic Association (NHTSA), USA had been recommending to include additional technologies on vehicle safety in NCAP Program: lane departure warnings and forward collision warning.
System Mobileye® has been tested by the world manufacturers of the complete equipment. The Mobileye’s solutions exceed NHTSA’s recommendations, and now they are a part of some production programs LDW + FCW for NHTSA.
Forward collision warning (FCW) predetermines inevitability of an accident calculating "time to collision" (TTC) based on the vehicle speed, relative speed and relative acceleration. Last units are measured by change of the image size (zooming). In case of a prediction of an accident the system will give to the driver a "critical" warning.
The collision warning track can be used as a trigger mechanism in relation to other systems of the vehicle to ensure pre-incident activity, such as secondary safety system or stop function.
The Mobileye collision warning algorithm also takes into account special scenarios when the system regards different levels of the driver’s reaction.
The vehicle ahead does not move: in this case there is a big advantage for optical sensor operation as the object will be identified as standing still. In many cases it is a scenario with constant speed and with high speed of approach. A warning can be emitted within 3 seconds prior to a potential collision.
The vehicle ahead is braking: braking is identified by recognition of the brake headlights of the target vehicle. It is a scenario with the lower speed of approach. In this case the warning can be emitted within 7 seconds prior to a potential collision.
The driver has already depressed the brake pedal: in this case a warning can be provided a bit later as the brake pedal has been already activated and there can be less time for collision avoidance. However it is important to provide the driver with the warning in these cases, because the driver may not notice slow drift at such conditions. It is a standby mechanism to notify the driver that the danger yet has not been past.