the only "MUP" i ever use is a bike/pedestrian lane on a local bridge. it has a dividing line, one side for peds and one for bikes. it has pictures of a biker and a ped on the corresponding sides of the line.

so none of the peds can manage to stay on their side, of course.

i'm liking the car horn idea. (and the shotgun, but the bridge is "patrolled" by police. on Segways, no less.)

maybe i'd manage to frighten them over the side.