M4 motorway Usk bridge

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The M4 motorway Usk bridge, with a slip road from the A4042 in the foreground

The M4 motorway Usk bridge (or St Julians Bridge) carries the M4 motorway across the River Usk in the city of Newport, Monmouthshire.

The bridge is actually two separate 450-ft bridges for the eastbound and westbound carriageways. When travelling westbound, the bridges lead directly into the twin 1,200-ft-long Brynglas Tunnels. Work commenced on both the bridge and the tunnels on 10 September 1962, two months after work commenced on the George Street Bridge further downstream. The entire Newport bypass section of the M4 (junctions 24 to 28) finally opened in 1967.

In 1989 a further two crossings (east/westbound) were added as a connection from the M4 (at the newly constructed junction 25a) to the north/southbound A4042 Heidenheim Drive.[1]


  1. M4/Newport-Shrewsbury Trunk Road A4042 (Relief of Brynglas Tunnels and Malpas Road) Order 1989
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