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In the early 1960s, deployment of rocket-powered ejection seats designed for use at supersonic speeds began in such planes as the Convair F-106 Delta Dart. Six pilots have ejected at speeds exceeding 700 knots (1,300 km/h; 810 mph).
Hitting an immovable object, such as a wall, the speed of the car would have to be 10-15mph. I suppose the difference would be that hitting the wall would be instantaneous deceleration, whilst hitting another vehicle would give a cushioning effect. Its not really a case of How fast but more a case of how hard. For example an air bag will deploy in the case of a stationary car being hit by a lorry at 5mph.