M48 shield
M48
M48 highlighted in blue
Severn Bridge (M48) full view - geograph.org.uk - 1742850.jpg
The Severn Bridge (M48)
Route information
Maintained by National Highways (England) and the South Wales Trunk Road Agent
Length13 mi (21 km)
Existed1966–present
Major junctions
East endAwkley
Major intersections
J21 → M4 motorway

J23 → M4 motorway
West endUndy
Location
CountryUnited Kingdom
Primary
destinations		Chepstow
Road network
← M45→ M49

The M48 is a 13-mile (21 km) long motorway in Great Britain, which crosses the Severn near Chepstow, Monmouthshire, linking England with Wales via the Severn Bridge. This road used to be the M4, and as a result is anomalously numbered: as it lies to the north of the M4 and to the west of the M5, it is in the Motorway Zone 5.[1][2] The M4, M48 and the A48(M) motorway are the only motorways in Wales.[3]

Route

Travelling from east to west, after leaving the M4 at Awkley, junction 21, near Olveston in England, the M48 begins by heading north-west towards Aust, junction 1. It crosses the Severn and Wye rivers via the Severn Bridge. Entering Wales, the M48 heads south-west after junction 2, passing to the south of Chepstow, past Crick and continuing in a south-westerly direction, passing Caldicot and Rogiet. The motorway rejoins the M4 at Undy, junction 23 to the east of Magor.

Junction 2 can be reached via the A466, which leads to the A48. The junction 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 more direct route for Chepstow and Caldicot.

History

Construction near the hamlet of Ingst
M48 toll booths
toll-free since 17 December 2018

The M48 was opened as part of the M4 in 1966.[4] 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.[5] The route became increasingly busy and in 1984 a report was commissioned.[6] After four years of construction, the Second Severn Crossing was opened in 1996 and was designated M4.[4] The original stretch of motorway was designated M48 and continues to link England and Wales. Since 17 December 2018, both crossings have been toll-free.[7]

In October 2021, the Welsh Government announced it was considering the possibility of reclassifying the M48 into an A-road. The government stated this is due to a large decrease in traffic following the opening of the Second Severn Crossing. The government plans to improve connectivity between local roads and the M48 in Wales but state that building new junctions to a Motorway-standard would be too costly considering the lower amount of traffic the M48 now handles. Reclassification of the motorway requires approval of both the Welsh Government and Secretary of State for Wales, with the Department for Transport stating they have no plans to reclassify the road.[8]

Services

Severn View services are at junction 1, formerly called Aust Services when originally opened, and may also be accessed via the A403 from Avonmouth. There is a footpath leading from the services 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. The original building offered views of the River Severn. It was sold and operations continue in a new, smaller development on an adjacent site nearer the motorway junction.[9]

Junctions

M48 motorway
mile km Eastbound exits (B carriageway) Junction Westbound exits (A carriageway)
117.6 189.3 London, Bath, 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		 Gloucester, Chepstow A466 (A48)
Caerloyw, Cas – gwent		 J2 Gloucester, Chepstow A466 (A48)
Caerloyw, 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

Data from driver location signs are used to provide distance and carriageway identifier information.[10] Where a junction spans several hundred metres and start and end points are available, both are cited. Information above gathered from Advanced Direction Signs May 2011.

See also

References

  1. ↑ "Motorway Database – M48". CBRD. Retrieved 26 October 2007.
  2. ↑ Steven Jukes. "Pathetic Motorways". Pathetic.org.uk. Retrieved 28 November 2012.
  3. ↑ "Roads in Wales". Traffig Cymru/Traffic Wales. Retrieved 10 September 2023.
  4. 1 2 "Severn Crossing Dates". The Motorway Archive. Archived from the original on 13 November 2002. Retrieved 26 October 2007.
  5. ↑ "Severn Crossing". The Motorway Archive. Archived from the original on 8 October 2007. Retrieved 26 October 2007.
  6. ↑ "Second Severn Crossing". The Motorway Archive. Archived from the original on 7 February 2012. Retrieved 26 October 2007.
  7. ↑ "Severn bridges: Final day of at least 800 years of tolls". BBC News. 16 December 2018. Retrieved 31 December 2018.
  8. ↑ Clark, Rhodri (18 October 2021). "Severn Bridge could be stripped of its motorway status". WalesOnline. Retrieved 11 November 2021.
  9. ↑ "Aust / Severn View Services". Motorway Service Area Trivia site. Archived from the original on 17 October 2004. Retrieved 18 April 2008.
  10. ↑ Traffic England Live Traffic Condition Map Archived 10 February 2012 at the Wayback Machine Highways Agency – Locations extracted from Traffic Camera Popup identifier text
Template:Attached KML/M48 motorway
KML is from Wikidata

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North and Mid Wales
Trunk Road Agent |list1 =

  • Bangor - Chirk Trunk Road (A5)
  • London - Fishguard Trunk Road (A40)
  • Newtown - Aberystwyth Trunk Road (A44)
  • Holyhead - Chester Trunk Road (A55)
  • Shropshire Boundary - Mallwyd Trunk Road (A458)
  • Cardiff - Glan Conwy Trunk Road (A470)
  • Glanusk Park (Crickhowell) - Llyswen Trunk Road (A479)
  • Swansea - Manchester Trunk Road (A483)
  • Fishguard - Bangor Trunk Road (A487)
  • Newtown - Machynlleth Trunk Road (A489)
  • Dolgellau - South of Birkenhead Trunk Road (A494)

|group2 = Managed by the
South Wales
Trunk Road Agent |list2 =

  • M4 motorway
  • M48 motorway
  • A48(M) motorway
  • London - Fishguard Trunk Road (A40)
  • Chepstow - Carmarthen Trunk Road (A48)
  • Newport - Worcester Trunk Road (A449)
  • Neath - Abergavenny Trunk Road (A465)
  • Chepstow - Monmouth Trunk Road (A466)
  • Cardiff - Glan Conwy Trunk Road (A470)
  • St Clears - Pembroke Dock Trunk Road (A477)
  • Swansea - Manchester Trunk Road (A483)
  • Fishguard - Bangor Trunk Road (A487)
  • Newport - Shrewsbury Trunk Road (A4042)
  • East of Abercynon - East of Dowlais Trunk Road (A4060)
  • Haverfordwest - Milford Haven Trunk Road (A4076)
  • A4232 Trunk Road (Capel Llanilltern – Culverhouse Cross Link Road) (A4232)

|group3 = Related topics and
further information |list3 =

| belowclass = hlist | below =

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