It connects St Ives in the east to St Just in the west, and eventually joins the A30 road to the northeast of Sennen in the southwest of the Penwith peninsula.
Notable settlements it passes through (from St Ives to the southwest) include Zennor, Boswednack, Treen, Porthmeor, Morvah, Bojewyan, Pendeen, Trewellard, Carnyorth, Botallack, Kenidjack, St Just, Bosavern and Kelynack.
[2] The bridge near St Just, dated to the early 19th century, became a Grade II listed building on 21 September 1973.
[4] The road is tight and twisting, and challenging to drivers.
[citation needed] In early 2009, after heavy rain and flooding near Zennor, the road was closed at Chykembro Culvert because of flood damage to its foundations.