I really haven’t started noticing this until the past year or so. Any and every time I see a U.S. Postal Service vehicle (typically, the small trucks that the postman drives around, delivering mail locally), the vehicle doesn’t have license plates, front or back! FYI, I’m a California resident so I can’t speak for the 49 States.
Typically, local and state public agency vehicles carry “Exempt” status license plates; so I’m wondering, did the USPS strike a deal with all 50 States to be free and void of having to affix license plates to their vehicles?