There used to be a travelling Wall of Death doing the motor cycle shows in the UK. They indulged in plenty of backfires and drumming up trade with the bikes in front of the Wall as good showman should. Great entertainment but I seem to re call it came up for sale and struggled to be passed on to regular work. The most I saw it go towards cars was a Kart. The Bikes used seemed to depend a bit on the guys doing it. The senior sort of bloke preferred a smaller Indian single as I recall.
On one Dutch Rally we were taken to a Learner Drivers compound complete with streets and a steep hill for practising hill starts, something some of Holland has not got in abundance. I thought all this was an excellent idea. Do initial coaching on this before venturing onto the real roads. The British ended up getting into trouble for consistently belting over the hill full of amusement that you needed to make one.
It is a matter of great irritation that my great bud Geoff and I, plus other interested guys, had a motorcycle and later a car stashed at School, used in woods and tracks outside hours, and in both cases ended up getting caught and hauled over the coals for it only to see both gain official clubs the minute we left. As a further aside, the same happened with our impromptu Forestry Group to remove dead Elms and tidy up the wooded areas (so we could run the vehicles through of course). It is marvellous how the good ideas get nicked by someone else and presented by them as new initiatives from the privilege of an inside position. I learned that lesson early but on balance prefer to be the non-conformist with ideas rather than do what the masses are told to do and shut up. Tricky to have both without responsibility I do not particularly want to shoulder so as to be thought 'a success'. A failure from my Schools point of view as I was meant to be an upper class drone bla bla hype. Well neither Geoff or did that and we seem to have had a good time and are OK.
So at some point some political knob will rediscover training kids to drive for the first time again while banning interesting little cars from fairgrounds on the basis it was someone else's idea and fun that might be dangerous.