M48 motorway

M48
The Severn bridge is the most prominent landmark on the M48.
Route information
Length	12 mi (19 km)
Existed	1966–present
Major junctions
East end	Olveston
Major intersections	J21 → M4 motorway J23 → M4 motorway
West end	Magor
Location
Country	United Kingdom
Primary destinations	Chepstow, (Newport), (Cardiff), (Bristol)
Road network
Roads in the United Kingdom Motorways A and B road zones

The M48 is a 12 miles (19 km) long motorway in Great Britain, which connects Gloucestershire, England, and Monmouthshire, Wales, via the original Severn Bridge. The M48 is anomalously numbered, as it is entirely to the west of the M5 motorway thus falling into zone 5 of the motorway numbering system.

Route

Travelling from east to west, after leaving the M4 – at junction 21 near Olveston in England – the M48 motorway begins by heading north-west towards Junction 1 near Aust. It then passes through a toll booth (westbound traffic only) and crosses the Severn and Wye rivers via the Severn Bridge and the Wye Bridge. Entering Wales, it heads south-west after Junction 2 Chepstow, then past Crick (to the north) and Caldicot (to the south). The motorway rejoins the M4 at junction 23 near Magor.

Junction 2 can be reached via the A466, which leads to the A48. Junction 2 gives access to the Wye Valley, an Area of Outstanding Natural Beauty. When travelling either east or west on the M4, the M48 is the most direct route for Chepstow.

History

Construction of the M48 near the hamlet of Ingst at that time numbered the M4

The M48 was opened as part of the M4 in 1966. Before this date traffic between South West England and South Wales was either transported on a motorail service through the Severn Tunnel, used the Aust Ferry (which was unsuitable for large goods vehicles) or travelled through Gloucester to pass north of the Severn Estuary.

After opening, the route became increasingly busy, and in 1984 a report was commissioned into a Second Severn Crossing. After four years of construction this new route was opened in 1996 and the M4 was diverted over the newer bridge. The original stretch of motorway was renumbered as M48 and now shares the traffic between England and Wales.

Services

Junction 1 is the location of Severn View services (formerly called Aust Services when originally opened for the M4 motorway), which can also be accessed by the A403, from Avonmouth. There is a footpath leading from the service station to allow pedestrians to cross the bridge.

When the M4 was diverted over the Second Severn Crossing, it was anticipated that these services may close. However, although the original building – which had offered views of the River Severn – was sold, due to business falling as a consequence of traffic using the newer bridge, operations continued in a new, much smaller development on an adjacent site nearer the motorway junction.

Junctions

M48 toll booths

Data from driver location signs are used to provide distance and carriageway identifier information. Where a junction spans several hundred metres and start and end points are available, both are cited.

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 (MOTO)
120.8	194.4	No tolls	Tolls	Toll booth
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. Miles are provided for information only, but are not displayed on the motorway. 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

Information above gathered from Advanced Direction Signs May 2011

See also

• List of motorways in the United Kingdom

External links

• CBRD Motorway Database - M48
• The Motorway Archive - M48