The United Kingdom's M48 motorway is a small motorway that was formerly part of the M4. It was renumbered after the Second Severn Crossing was completed. The M4 itself now goes over the Second Severn Bridge.
Junction 1 of the M48 links Alveston and Severn View services at Aust to the bridge, while Juncton 2 serves Chepstow. The motorway then merges back with the M4 near Magor.
