A taut, braided steel cable stretched across the road...say, about a foot a above standard handlebar height...would diffuse this critical mass.
".........[Andy] You know, I have a great mind to take the motorcycle away from him and leave him with the side car and fill it up with sand and give him a bucket and a shovel and let him play in it on weekends.
Aunt Bea: I saw in a war picture once these nazis riding around on their motorcycles.
And these guerrillas strung a wire across the road so high and when these nazis came roaring through
[Andy] We don't want to kill him.
Maybe hurt him a little but we don't want to kill him.
[Anut Bea] Well, you have to do something.
[Andy] I wish we had a psychiatrist in town.
Barney'd be a real study......."
“Barney’s Sidecar”
Taut like a tiger!
If these people really wanted to change things for the better, they could be promoting diesel engines for cars as they burn so clean now that most of the exhaust is water vapour.