The A5139 is a link road in Wallasey at the northern end of the Wirral peninsula.
Starting at junction 1 of the M53, where it also meets the A554, the route begins as two separate carriageways either side of the M53 – which runs into the A59 approach road to the Kingsway Tunnel – and this first section of the A5139 indeed provides a link between the J1 roundabout and the tunnel road. A slip road bears off to join the tunnel approach and the eastbound A5139 crosses over to join the westbound carriageway, the road then continuing on as a normal dual carriageway. It passes an industrial estate before reaching a roundabout junction with the A5088. This marks the end of the new-build section of the A5139, constructed as a motorway connection, and the remainder of the route is an upgraded formerly unclassified road.
The road becomes S2 on the far side of the roundabout as it runs through the industry (or lack of it) surrounding the docks. We soon cross the A5027 at traffic lights and continue on along more of the same: large warehouses, modern industry, and waste ground. After a couple of bends the road ends at a roundabout junction with the A554 at the northern end of the Tower Road bascule bridge.
An amended OpenStreetMap trace for this route awaits uploading to the SABRE Wiki.
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