|Location Map ( geo)|
|Distance:||11.1 miles (17.9 km)|
|Meets:||A30, B3283, A30, B3317|
|Route outline (key)|
Trevescan - Trereife
The road starts on the A30 between the village of Sennen and Land's End, just on the outskirts of the small hamlet of Trevescan. It therefore makes this mainland England's second most westerly classified road (and the westernmost Class II road). Signs at the start indicate a destination of Porthcurno via this road and the A3077. That seems to made little sense as the A3077 is a defunct part of road in Penzance and way past Porthcurno.
Past the hamlet of Trevescan it's back out into the fields and drystone walls in this part of Penwith. There are plenty of sharp bends. The next sign indicates St Levan but there are no buildings here. The church of St Levan is off the road on the other side of Portcurno, so this sign must be for the parish of that name. Polgigga is the next named hamlet and has a 30 mph limit which continues to the village of Trethewey. In the village is a right turn to Porthcurno, with its wartime telegraph museum, stunning beach and the open-air Minack Theatre which is built into the cliffs.
The village is left behind but the 30 mph limit continues for a while, seemingly unnecessarily. The road drops into the trees in the Penberth Valley. It's down Treen Hill, then back up the other side on St Buryan Hill. The latter is the steeper hill and includes a near-hairpin bend.
A right turn TOTSO is necessary in the hamlet of Sparnon. Straight on becomes the B3283 for St Buryan. At Treverven a caravan/camping site is passed, then there is a long section of rural farmland and sections in the valleys with trees. At one such section is the turn for Lamorna Cove, another picturesque small harbour. There's more of the same ahead until the road reaches Sheffield (this one is a small Cornish village/hamlet, not a large industrial Yorkshire city) where there is a 30 mph limit and a chicane. The village and the 30 mph limit don't last long and they don't consider a chicane necessary at the other end.
The town and fishing port of Newlyn is reached at Chywoone Hill where there is a 16% gradient warning. Then you are slap bang into a 20 Zone. As you drop down the hill you can see the sea and Penzance beyond. A crossroads (priority for our road) is ahead but it's another TOTSO and you must turn left to continue the route.
Following The Coombe (appropriately enough along a valley) the 20 mph zone ends. There is a 30 mph limit through the next section. NSL is resumed just before the end of the road at a crossroads with the A30 and B3317. So this is a route which starts and finishes on the same road.
In 1922 on first numbering the B3315 continued straight ahead where it now turns left in Newlyn. It ran along New Road before entering Penzance on the Western Promenade Road and after meeting the B3314 Alexandra Road ended at Battery Road at Penzance Docks. By 1932 that section had been numbered as the A3077 (the number still mentioned on signs at the western end of the B3315) and the B3315 just terminated on first entering Newlyn. The section turning left along The Coombe in Newlyn and the straight on route here were the A3077 until very recent times. When the A3077 was abolished the B3315 was extended along part of its route (that before then was the B3316).