The street the bus stop is on was changed to restricted access - only buses and taxis - about a year ago. Plenty of signs, plenty of time for people to have noticed.
Today there was a policewoman and a traffic warden stopping the cars that were coming through and pointing out that they'd just been past signs telling them they couldn't come down this road and telling them off ;) In the 5 or 10 minutes we stood there they must have stopped a dozen or so cars. And each driver looked somewhat sheepish as they drove on.
Kept us amused while we were waiting for the bus, too ;)