The maximum individual truck length is 12 metres, articulated truck and trailer length is 16.5 metres and road trains are allowed up to 18.75 metres. The maximum width for all is 2.55 metres.If a vehicle has an overall height of 3 metres or above, a notice is required must be displayed in the cab showing its full height. The main vehicles used to transport goods by road are Articulated Lorries (Artics).These consist of a tractor unit with a turn-table device which can be linked to a trailer. With or without a trailer, the Gross Combination Mass-the combined prime mover and trailer-must exceed 3.5 tonnes.he main vehicles used to transport goods by road are Articulated Lorries (Artics). These consist of a tractor unit with a turn-table device which can be linked to a trailer. With or without a trailer, the Gross Combination Mass-the combined prime mover and trailer-must exceed 3.5 tonnes.