Missing the big oportunity
Think toy cars - the ones you pull back then let go.....
Just the scale the concept up. You park your car in the garage in the evening and rollers slowly wind your wheels back overnight. In the morning you get in (after opening the garage door) and push the 'release' button and ZOOOOOOMMM.. You're off, on your way to work.
Of course junctions would have to be slightly redesigned to take account of the non-stop nature of this method of propulsion and 'wind-back' points installed at every motorway junction.
Compensating for scale, and the reduced weight of no batteries and engine, I think top speeds of several hundred miles an hour and duration of many minutes could be acheived.
Paris, 'cos she can push my release button any day.