From Jerripedia
Pier Road
Pier Road was once a very important road, because it was the only link between the centre of St Helier and Havre des Pas. This explains the strange name, because the road is well inland from the piers of St Helier Harbour. The pier referred to was probably an early jetty at Havre des Pas, which was the closest mooring to the town centre. The road was formerly known as Le Chemin du Chaussée.

Looking down on Pier Road from Fort Regent with St Helier Harbour in the background
The road in the early 20th century with Fort Regent above