|Location Map ( geo)|
|Approaching the tunnel from the south|
|Crossings related to the A40|
|A40 Bridge • Bridstow Bridge • Carmarthen Bypass Bridge • Chain Bridge (Llandovery) • Cherwell Bridge • Fishguard - Rosslare ferry • Holborn Viaduct • Marylebone Flyover • Over Bridge • Pont Lesneven • Wheatley Bypass Bridge • Witney Bypass Bridge|
The Gibraltar Tunnels (more commonly referred to as the Monmouth Tunnels) are a pair of bored tunnels carrying the A40 through Gibraltar Hill near Monmouth. They were constructed in the late 1960s as part of the route linking the Midlands to South Wales.