In some states, you can and will be ticketed if you don't stop whenever someone steps off the curb. I seem to remember hearing or reading that is the case in Massachusetts, so you may see drivers from out of state being very cautious even elsewhere.

Also, the other day, I was making a left from a one-way street, from the left side of it, and someone tried to drive around me on the shoulder to the left, because they were unaware I was waiting for a jogger pushing a stroller to cross in front of me.