Based on the current driving speed and the distance to the vehicle ahead (determined by radar), a collision avoidance system warns the driver first and intervenes if no human action is taken.

An important protection against a midair crash is technology known as a traffic collision avoidance system, or TCAS. The system, which is required on passenger airlines, alerts pilots when two ...

D.C., has led to many questions about the role played by the Traffic Collision Avoidance System, or TCAS. While you can read our report of the incident here, it should be restated that, at this early ...