It wasn't hard to figure out which side of the road to drive on in England. The conventions like you are talking about Q was an entirely different matter.

Other driver found me much too timid on the large roundabouts Excuse Me for not wanting to have to explain to a Bobby that my blind spots were reversed and the mirrors on the van were too small.

Getting back to Bert's purpose of this thread. Having tiny mirrors that fold in in tight quarters proved handy. Having them be too small to be useful as mirrors, not so much! Not the Worst invention but certainly they fell short of the mark.