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.