Postal carriers a la car

On my way home today, I saw a postal carrier parked at the side of the street in his personal car. Sitting in the driver’s seat, getting his mail sorted. It was the first time I had even seen that happening. I’ve seen them in trucks, going to pick up mail from the service boxes, then walking to the required destinations. Never had I seen one actually drive to where they need to go. Unusual sight for sure.