It connects Girvan to Glasgow via Maidens, Ayr, Galston, Turnberry, Kilmarnock, Waterside and Moscow.
[3] The original route of the A719 was described by the Ministry of Transport in 1923 as "Milton – Pennyglen – Doonfoot – Ayr".
A 0.25-mile (0.40 km) section of the road following the Croy Railway Viaduct presents an optical illusion to drivers, which makes viewers at the Brae believe vehicles can roll uphill.
It replaces an earlier bridge constructed by Alexander Stevens in 1789, which had become unsafe owing to flooding in 1877.
[10] Between Galston and Moscow it crosses the River Irvine on a Category B listed bridge built in 1839.