I am against the idea personally, the police are enforcers of the law, but they are not judge, jury and executioner, it takes years and years studying law to achieve that status.
It wasn't very long ago that Police effectively had powers removed thanks to new legislation preventing the regular reasonless abuse towards particular groups of our motorists in our society, giving them this power will not only re-instate that old abuse but exceed it.
Where will these powers end? It won't be just motorists, cyclists will be targetted also. There won't be any excuses and no higher power will care.
With no court process in place, who is going to police the police?