The road measures 52.66 miles long and would take a car obeying speed limits 1 hours and 33 minutes to travel its length.
The A420 is a A Road and is located in the Zone 4 Highways Region.
This is a true long-distance route, journeying through numerous towns like BRISTOL, Kingswood, Warmley, Bridgeyate, Wick, Cold Ashton, Marshfield, Upper North Wraxall, North Wraxall, Lower North Wraxall, Ford, Yatton Keynell, Lanhill, Allington, CHIPPENHAM, Bumpers Farm, SWINDON, South Marston, Lower Bourton, Shrivenham, Watchfield, Longcot, Great Coxwell, Little Coxwell, FARINGDON, Littleworth, Buckland, Longworth, Southmoor, Kingston Bagpuize, Fyfield, Tubney, Tubney Wood, Besselsleigh, Cumnor, Botley, Headington, and OXFORD.
The road passes through several counties, including Bristol, Gloucestershire, Wiltshire, and Oxfordshire.