The A2031 is an urban A-road through the Sussex coastal town of Worthing. Originally the B2141, it gained its current number in 1935.
The road starts at the A24/A27 Offington Roundabout and appears to the unwary as a continuation of the A24, which instead multiplexes off east with the A27. It meets the A2032 at the Thomas-a-Becket traffic lights and then continues south, making a small bypass of the middle of Tarring, and crossing the railway line at a level crossing at West Worthing Station.
The road TOTSOs left at traffic lights immediately afterwards; indeed, the stop line is on the near side of the railway line. It then proceeds east to meet the A24 again, this time in the centre of Worthing.
The 0.4 mile West Tarring Bypass was opened on 24 June 1933, whilst the road was B2141.