Any quantitative estimate of how much would be generated? Also, the more you try to recover, the firmer the ride. The more power you try to extract from a generator, the harder you have to turn it (or in this case, push it).
Next, there will be regenerative springs on the bus seats, regenerative shirt collars to make electricity from turning your head or flappin’ your jaw. Armpit regenerators, Pants regenerators, etc., etc..