Think about what you're doing when you initiate the pass. I'm pedaling up a hill, allowing an arm's width of asphalt to my right, as suggested by the League of American Bicyclists. I'm more visible stuck out there in the lane.
By sneaking or gunning it to get by on the incline—where you can't possibly see beyond—you endanger:
Sharing the Road means keeping all road users safe. Slow down and think. That's all I'm asking. If you attempt to pass on a hill while an oncoming vehicle crests, you'll run me off the road, or (heaven forbid) have an accident with all of us involved. You can be 5 minutes late for your appointment or to meet your child. Pull over and call ahead if you're running late. It could be your son or daughter on that bike so please be considerate and yield until it's clear to go by. Life's too short as it is.