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 Tunbridge Wells, Ashford and Tenterden. Most services are operated by Arriva and some operated by Nu-Venture. Stagecoach also operates route 10X in the town to Ashford via Lenham, with most buses continuing onto Hythe and Folkestone. There are weekday commuter coach services between Maidstone and London. Former bus operators in Maidstone include Maidstone & District Motor Services (M&D); Maidstone Borough Council Transport, later Boro'line Maidstone; and Bygone Buses. In 2004 the centenary of Maidstone Corporation Transport was marked with several events, featuring a preserved Maidstone trolleybus. When the railways were built in the 1840s, Maidstone was not well served. It