Stop! at sidewalks.

A little known law in a majority of states is the requirement of both motorists and bicyclists to stop before crossing a sidewalk
as they enter a street.
The rationale behind the law is to ensure the safety of those road users who may be using the sidewalk. Do your own 5 minute
data study. Watch 20 cars and/or bicycles enter the roadway from a private or public driveway and count (on one hand) how many
actually stop before proceeding across the sidewalk and into the street.