orange round marker turn signal on cargo dry van semi trailer

american anticipatory area arrow attention automobile big cargo carriage carrier carrying cautionary commercial conveyance delivering delivery details direction distances drive duty eighteen fleet freight going haul heavy industrial industry information light lights loads logistic logistics long lorry maneuvers marker orange outdoors parking parts protection rest rig rigs road row safety semi shipping signal stand standing stop tractor traffic trailer trailers transport transportation transporter transporting travel truck trucking trucks warning wheeler