Originally Posted by
Artkansas
It happens, but as long as he maintains his pace and doesn't slow you down further, no problem.
The problem is if he passes you then slows down to slower than you were going, forces you to pass, then speeds up again and passes you and then slows down again ...

This is also a huge problem with people going slower than you on MUPs who don't slow down, let alone stop, for stop signs. Along the Burke in Seattle there are stretches that have quite a few reasonably placed stop signs and many a time I have ended up stuck behind someone going a little slower than I would have preferred because I wanted to avoid leapfrogging with them for 2 or 3 miles.