the "worst case scenario scares me"

in the city the sidewalks cross over less alleyways than a sidewalk may cross over driveways in the suburbs
but each has its dangers

the "worst case scenario" scares me
cars pull out of alleyways and driveways with no estimation of human activity on the sidewalk 
most car drivers pull out past the sidewalk not stopping till the far end of the bumper of the parked car before giving a blind glance for approaching car traffic