Rochester, Kent the Blackheath Beds of sand and gravel. As a human settlement, Rochester became established as the lowest river crossing of the River Medway, well before the arrival of the Romans. It is a focal point between two routes, being part of the main route connecting London with the Continent and the north-south routes following the course of the Medway connecting Maidstone and the Weald of Kent with the Thames and the North Sea. The Thames Marshes were an important source of salt. Rochester's roads follow north Kent's valleys and ridges of steep-sided chalk bournes. There are four ways out of
Maidstone in Kent to be turnpiked was from Rochester to Maidstone, in 1728. The A20 runs through the town and the M20 motorway runs to the north. Opened in 1960 as the "Maidstone Bypass" A20(M), this was the first motorway south of London. Maidstone is a hub for major roads: the M20 motorway, the A229, A249, A20 and A26. The M2 motorway is a short distance to the north and the A21 also runs close to the town. The historic centre of the town is largely pedestrianised or with restricted access for private vehicles, which are diverted around a one way