The distance is detected by radar or sonar and comes from the front of the car. A curve means you’re no longer dead on to the car in front of you — and in extre

The distance is detected by radar or sonar and comes from the front of the car. A curve means you’re no longer dead on to the car in front of you — and in extreme cases, are dead on to a car from another lane. This proved difficult for the radar packages of the 00s