+1. The MUP that I commute on has signs and even pictures for those that can't read or speak English. They all say stay to the right and pass on the left. They also mention that all dogs must be on a leash... it just irritates me when the dog walker has the leash stretched out all the way across the MUP. I slow down to about 5 mph when encountering any dog walker. I also slow down to about 10 mph when approaching any jogger/walker. If the MUP is not busy... I slow down and pass on the left without warning. I've learned that shouting "on your left" pretty much means the walker is going to turn around and move to the left and try to walk into your bike.

It's a commute... I'm not in an extreme hurry to get to work. I'm on the bike to enjoy the MUP (mine happens to be rather scenic most of the way), get some exercise, and get my mind ready for work or cleared for my evening at home.