Forward collision warning system (FCW)
Each year many people die because of carelessness to the forward vehicle. Forward collisions have more contribution in statistical accident data. Research studies have shown that alerting drivers, even sooner than a millisecond, would avoid many accidents. If a simple calculation of time to collision (TTC) gets below a predefined threshold the warning system will be triggered. Many methods have been introduced to calculate the alerting time using some criteria such as Steering threat number (STN) or Braking threat number (BTN). It includes a single camera which is mounted on the windshield in the back of the rearview mirror.