This article is about the apparently current B728 in Ardrossan. For the original B728 in Kirkcudbrightshire, see B728 (Kirkcudbright).
The North Ayrshire Council list the B728 as currently being Sorbie Road and South Beach Road in Ardrossan. This road was first indicated as being a B road in 1932, although as yet no mapping showing its number has been found. However, if the council list is accurate, this route still exists despite no longer being marked on any maps.
The route is a straightforward link between traffic lights on the A738 (former A78) down to the B780 (former A738) on the sea front. At the Traffic lights, the road is signed only for the station and park and ride, and to make matters worse, there is a TOTSO half way along where the B728 turns right from Sorbie Road into South Beach Road. It then crosses the railway on a bridge next to the station, before quickly coming to an end looking out across the Firth of Clyde.