Postal workers know it, of course. Not normally dangerous work, except when for some unfortunates it occasionally turns out to be extremely dangerous.
That's a big part of the value the USPS has been to us, though. It's so intricately involved with the life of the nation. Door-to-door delivery is a gift to society in so many ways. LA, where I worked as a real estate appraiser, is thousands of communities of many cultures, most without names or attention, but carriers could tell you there were marked differences between the cultures of two adjacent condo buildings at the beach or that the notably well kept but very ordinary little houses on the left side of a street began a treasured Greek neighborhood where everyone had relatives waiting for a rare chance to buy in.
I had to look it up to be sure, but we've gone through Lincoln a couple of times when visiting friends up that way. You stopped at a diner, we stopped for my husband to fish a river the highway followed. 
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