M48 motorway

M48
The Severn Bridge (M48)
Route information
Maintained by Highways England and the South Wales Trunk Road Agency
Length	12 mi (19 km)
Existed	1966–present
Major junctions
East end	Awkley
Major intersections	J21 → M4 motorway J23 → M4 motorway
West end	Undy
Location
Country	United Kingdom
Primary destinations	Chepstow
Road network
Roads in the United Kingdom Motorways A and B road zones
← M45 M49 →

The M48 is a motorway in the United Kingdom. It links Gloucestershire, England with Monmouthshire, Wales over the Severn Bridge. The motorway is 12 miles (19 km) long.

Junctions

M48 motorway
mile	km	Eastbound exits (B carriageway)	Junction	Westbound exits (A carriageway)
117.6	189.3	London, Bristol M4	M4 J21 Terminus	Chepstow, Services M48 Start of motorway
120.5	193.9	Avonmouth A403, Services	J1 Services	Avonmouth A403, Services
121.1 122.8	194.9 197.6	Severn Bridge Entry into England Wye Bridge	River Severn Border River Wye	Severn Bridge Entry into Wales Wye Bridge
123.2 123.4	198.2 198.6	Chepstow A466 (A48) Cas – gwent	J2	Chepstow A466 (A48) Cas – gwent
130.2	209.6	Start of motorway Chepstow, Services M48 Cas – gwent, Gwasanaethau	Terminus M4 J23	Newport, Cardiff M4 Casnewydd, Caerdydd
Notes Distances in kilometres and carriageway identifiers are obtained from driver location signs/location marker posts. Where a junction spans several hundred metres and the data is available, both the start and finish values for the junction are shown.
1.000 mi = 1.609 km; 1.000 km = 0.621 mi