I live in a semi-rural area where people have their mailbox at the end of their driveway. I order to avoid walking to the box to pick up their mail, they will drive up to it in their vehicles. This often means that they will wind up on the shoulder facing against oncoming traffic. This is a serious hazard to cyclists who are forced to take the lane at an inopportune time. It also effects oncoming cars who generally swerve into oncoming traffic to avoid the vehicle on the shoulder. I was once riding with my group AFRAP when a lady approaching from the opposite direction came at us head on with absolutely no hesitation across the center line to access her mailbox. It was truly unbelievable. She literally did not give a care that there were cyclists there. Plus she screamed at us to get out of her way. In retrospect, I think she may have been mentally ill.
Aside from the safety aspect, there is the laziness aspect. Most of these people are perfectly capable of ambulating to their mailbox, and most of them have a fifty foot driveway. The laziness is stunning.