long refrigerator semi trailers stand in row in warehouse docks with gates and loading cargo

american anticipatory approved area attention automobile big building cargo carriage carrier carrying cautionary commercial conveyance delivering delivery destination direction distances drive duty eighteen equipment fleet freight haul heavy industrial industry loads logistic logistics long lorry lot parking pipes protection reefers refrigerator rest rig rigs road row safety schedule semi shipping stand standing stop tractor traffic trailer trailers transport transportation transporter transporting travel truck trucking trucks waiting warehouse warning wheeler white