My parents live in a rural area south of Chicago on busy Arsenal Road, where the speed limit is 45 mph & trucks & cars travel 55 mph or more. When they built the house in 1972 it was a gravel road & having the mailbox on the opposite side of the road was not a problem. Now in their late 70's when they cross the road to get their mail it is like crossing a highway. They are both in ill health with handicapped parking privileges. The local post office tells them there is nothing they can do. What are their rights concerning moving the mailbox to the other side of the road or near the house?