The A433 road is an A road and primary route in Gloucestershire. It starts at a junction with the A46 at Dunkirk (51.5754°N 2.3017°W) [A433 road (western end)], 5 miles (8.0 km) north of junction 18 of the M4 and 4 miles (6.4 km) northeast of Chipping Sodbury. It then runs for 16.5 miles (26.6 km) to a junction with the A429 just west of Cirencester (51.7011°N 2.0006°W) [A433 road (eastern end)]. On its way to Cirencester the road passes the spectacular Westonbirt Arboretum, and runs through the villages of Westonbirt, Doughton, Tetbury and to the north of Kemble and RAF Kemble. The last 2 miles (3.2 km) follow the route of the Fosse Way. Along the way the road passes the Thames Head pub before heading over a crest and under the Golden Valley Line in a tunnel which has no pavement for pedestrians and no restrictions on the speed limit before rising over another crest.