Lorries (up to 7.5 tons) can do 70 mph on motorways. Larger vehicles, and any vehicle towing a trailer (eg cars with caravans) are restricted to 60mph. Not all wagons have delimiters yet, so it is dangerous to assume that they can't do more than 90kph (c56mph). Vehicles travelling at 50mph on a motorway may be stopped for travelling too slowly.

The regulations in Ireland are slightly different.