As a rule, I try to yield to motor vehicles (except for that one time I made a school bus stop to yield to my right-of-way). My position is that they move faster than me and therefore will be out of my way faster than I would be out of their way. Plus, vehicles close behind me over long distances make me nervous. I'm primarily interested in my own safety, and I'm not (usually) going to compromise it just because I have the right-of-way. I tell my kids the same thing--it's no use being "in the right" if you're dead.