The B3316 was a short road to the west of Penzance.
It started on the B3315 in Newlyn one block inland from the sea. It then headed inland along The Coombe (a stream valley). After crossing the B3313 it ended on the B3317 a short distance beyond.
In the mid-1920s the B3313 was renumbered as a western extension of the A30. Around the same time the section of B3316 to the south of this road was also upgraded to Class I status, becoming part of the A3077. However, the B3316 did not have much longer. In 1935 the remaining section was renumbered B3317 - although it did not become a spur of the original B3317 as that road became the A3071 at the same time....
Renumberings in the Penzance area mean the A3077 no longer exists and therefore the southern half of the ex-B3316 is now part of the B3315.
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