Penmaenbach Tunnels
| Penmaenbach Tunnels Twnelau Penmaen-bach | |||
| Location Map ( geo) | |||
 | |||
| |||
| From: | Conwy Morfa | ||
| To: | Dwygyfylchi | ||
| Location | |||
| SH746784 | |||
| County | |||
| Caernarfonshire | |||
| Highway Authority | |||
| Welsh Government | |||
| Opening Date | |||
| 1932 (eastbound), 1989 (westbound) | |||
| Additional Information | |||
| |||
| On road(s) | |||
| A55 | |||
| Crossings related to the A55 | |||
| Britannia Bridge • Chester Bypass Bridge • Conwy Tunnel • Holyhead - Dublin ferry • Holyhead - Dun Laoghaire ferry • Pen-y-Clip Tunnels • St Asaph Bypass Bridge • Stanley Embankment | |||
The A55 trunk road passes through the Penmaenbach headland, between Conwy and Penmaenmawr, by means of two tunnels. The shorter tunnel, now normally used by eastbound traffic, was built in the early 1930s. The longer tunnel, normally used by westbound traffic, was built in the late 1980s as part of the dualling of the A55 from Chester to Bangor (later extended to Holyhead).
Because the approaches to the 1930s tunnel are poorly aligned, the 1980s tunnel was designed to allow a new longer eastbound tunnel to be built alongside it at some future date.
There is also a parallel 19th-century railway tunnel.
To the seaward side of the 1930s tunnel is a pedestrian route which is the remains of Telford's original road, which formed the A55 before construction of the 1930s tunnel.
