The length of highway subject to the charging regime is a length of the A282 Trunk Road of approximately 3.5 kilometres from a point below the north face of the bridge carrying Crossways Boulevard University Way (A206) over the Trunk Road at Junction 1a at Dartford in the County of Kent, and extending northwards to a point approximately 300 metres north of where it crosses London Road at West Thurrock in the County of Essex, the highway being labelled A on the plan, and carried through twin tunnels beneath the River Thames and on the Queen Elizabeth II bridge over the River Thames.