The Romans began their occupation of Britain in 45AD, and Watling St was probably their first road, giving them access to the centre of the new Province from the coast at Dover (Dubris).
Marble Arch in London marks the start of the modem A5 trunk road to Holyhead. For most of its way this road follows the Roman Watling Street and also the first trunk road built in Britain after the Romans left: Telford's road to Holyhead, providing a link to the capital for MPs and others from Ireland.