This article is about the Class III road numbered C21 maintained by Fife Council. For other roads numbered C21, see C21.
The C21 starts on the B939 Strathkinness Low Road, near the western edge of St Andrews, and heads west along Strathkinness High Road to the village of the same name. It ends, as plain High Road, on the C4, Main Street. The road is signposted as unsuitable for large vehicles, is generally less than 6m wide, and is very exposed to southwesterly winds: In the early 1980s, a double-deck school bus was blown right off the road, thankfully with no injuries to passengers.
The St Andrews West development masterplan shows the eastern end of the C21 road will be diverted down to a new roundabout on the A91 Guardbridge Road. Construction on the roundabout and the eastern part of the link road began in October 2018, opening up access for the further development. However, it is expected that much of the traffic generated from the new housing areas will prefer to use the C21 through Strathkinness as soon as the through route west is opened up.
The High Road from St.Andrews approaching Strathkinness.