The A2 is an important road in South East England. It goes between London and Dover. In Dover, it connects to the port to France. The road follows tracks used by the Celts and the Romans over a thousand years ago. It once linked to the three main Roman ports: Rutupiae (now Richborough), Dubris (now Dover) and Portus Lemanis (in modern Lympne). It was given the name "A2" in the 1920s. Now, the road is about long.