Dodging motor vehicle traffic. My whole commute is on high speed roads ranging from interstate 5 to several local arterial roads. The speed limits range from 70MPH to 45MPH and motorists typically drive as fast as they feel they can get away with.
Although honestly at times they trip over themselves and the motor vehicle traffic comes to a complete halt... that's when it's really fun... as there is always one or two motorists that feel they have the right to go anywhere with their cars and they will drive in bike lanes, cut through parking lots, drive across medians, make right turns from left lanes... and just about do any darn thing they can get away with.
I long for a nice quiet MUP with a dog or two...