Rules of the road?

What is the rule for mopeds??

I know how to deal with pedestrians and bycyclists, but mopeds? Seriously, if you can't reach the speed limit on whatever mode of transportation you choose to use (motorized), the get off the road! Don't wave me around you after I've been carefully trailing behind you at 10 miles LESS than the suggested limit for a couple of miles. Geez...