The A2042 runs from the entrance to Eastwell Manor in Kennington (a northern suburb of Ashford) to the A2070 Park Farm TOTSO junction to the south of the town centre.
The route starts at traffic lights where the A251 TOTSOs and heads south along an urban street called Faversham Road (originally part of the A251). We soon reach the A28 at another set of lights and turn right to multiplex along that road (complete with bus lane); traffic for the A2070 – and hence the other end of the A2042 – is advised to turn left.
The multiplex lasts until the A28 departs just after crossing the M20, leaving the A2042 to run towards the town centre via North Street. There's a brief multiplex with the A292, then the A2042 runs down towards the station along the eastern section of the former Ashford Ringway (which was one-way and numbered A292). The road duals just in time to leave the Ringway (although things have altered so you'd never know) and cross the railway line. It passes the designer shopping outlet (Europe's largest tented structure) and a roundabout which used to have a mini 'Stonehenge' in the middle, only to bear left at the next roundabout until the A2070 steals its thunder spiralling up from Park Farm, Hamstreet, Lydd and Hastings.