well, i do a lot of my cycling on a campus w/50000+ students, so peds are definitely up on my list of annoyances. also appearing prominently are BICYCLISTS on cell phones (sometimes i pray for natural selection to work faster), basically any large SUV since chances are pretty good that it's a frat guy/sorority girl driving alone and blabbing on their cell, and taxis (60mph is not the speed limit last time i checked).