certainly used to be - whose going to enforce that one anymore? "i didn't realise they were on" "i was trying to join the traffic for 10 minutes" "the engine stalled" etc etc. Probably only relevant if connected to a fatality/serious injury these days. Definite "nick" in the 70's - you could get pursued and stopped for flashing your lights back then (not a d.e.).
People who are incapable of logical thought when using public transport and stop at the end of escalators/in doorways/on through routes to chat/get their bearings/check their socials. TfL’s inability to make a halfway decent travel app, rather than the one that appears to waste your time/cost you money. TfL’s inability to fix the signal at Southfields that keeps buggering up the Wimbledon branch of the District Line.