Except when they're navigating to/from the highway and their destination within the city, picking up and delivering loads, and stopping at a truck stop for fuel

Except when they're navigating to/from the highway and their destination within the city, picking up and delivering loads, and stopping at a truck stop for fuel, food, or rest. The above is just for OTR (over the road, i.e. long haul), and you've got regional drivers, many who spend all day making deliveries within a much, much smaller geographical area.