This article is about the current A3071 from Penzance to St Just.
For the former A3071 in Axminster, Devon, see A3071 (Axminster)
The A3071 starts at Mount Misery, the rather depressing sounding roundabout above Penzance which marks the end of the A30 as a primary route.
The initial 50mph limit quickly gives way to the NSL and it's out into the countryside. The first junction with a classified road is with the very short B3317, but this is completely unmarked on the ground. The Tremethick Cross is marked as a junction, but these roads are unclassified. Next is the village of Newbridge, which is small but does get a brief 30mph limit.
The B3318 then leaves on the right and is marked for Pendeen.
Laterly, the Atlantic is glimpsed and the B3306 is a junction on the left. That road forms the junior partner in a useless multiplex with this road as our route gets its 30 mph limit back and drops down into St Just and then gives up in the narrow streets of the centre; leaving the B3306 to continue.
In 1922 the whole route was numbered as the B3317. It was renumbered sometime between 1932 and 1946.