National Highways Confirms M5 and M48 Road Closures Bristol 2026

Key Points

• National Highways has confirmed seven major overnight road closures across motorways and A-roads in the South West for Thursday night, August 6.
• The affected routes include key transit corridors across three motorways, notably the M5 and the M48.
• Four separate closures are scheduled along the M5 motorway to allow for routine and essential maintenance works.
• The M48 Severn Bridge, connecting South Gloucestershire and Wales, will undergo a full westbound carriageway closure alongside lane restrictions eastbound.
• Most roadworks and carriageway restrictions are scheduled to begin at 8:00 PM on Thursday and remain active until 6:00 AM on Friday morning.
• Strategic diversion routes via alternative arteries, including the M4 Prince of Wales Bridge, have been established by highway authorities.

Bristol (Bristol Express News) August 6, 2026 – Transport managers at National Highways have officially verified a series of seven strategic overnight road closures across the South West regional road network scheduled for Thursday evening, August 6. The overnight maintenance programme encompasses major arterial links including four separate sections of the M5 motorway and the M48 Severn Bridge link between England and Wales. According to official scheduling releases from National Highways, the majority of the planned closures will take effect from 8:00 PM on Thursday night, staying enforced until the early morning hours of Friday to minimize disruption to daytime traffic.

Which motorways and trunk roads are closing in Bristol and the South West on Thursday night?

As reported by transport reporters at Bristol Live, National Highways confirmed that seven planned closures will impact three distinct motorways and key A-road connectors in the South West region. The scheduled maintenance covers high-volume corridors surrounding Bristol, Gloucestershire, and Somerset.

The main routes subject to Thursday night closures comprise:

1. M48 Westbound (Junction 1 to Junction 2 Severn Bridge): A full westbound carriageway closure across the original Severn Crossing from 8:00 PM on Thursday, August 6, until 6:00 AM on Friday, August 7.
2. M5 Motorway (4 Individual Section Closures): Four distinct carriageway and slip road maintenance operations along the M5 artery between Gloucestershire and Somerset.
3. A-Road Regional Connectors: Targeted overnight lane or carriageway restrictions on two additional primary trunk roads feeding into the South West network.

As reported by travel correspondents at Bristol Live, National Highways spokesperson representatives stated that “these closures are planned overnight when traffic levels are lower, but they can result in longer journey times for some late-evening and early-morning transfers.”

How will the M48 Severn Bridge closure operate overnight?

As reported by infrastructure specialists at National Highways, the M48 Severn Bridge will experience a full westbound closure alongside single-lane restrictions eastbound. Drivers traveling from England towards South Wales via Junction 1 (Aust) will be re-routed.

As stated by National Highways engineering team leads in their official updates,

“Westbound traffic will be diverted via the M4 Prince of Wales Bridge, while daytime lane two closures and 30mph speed restrictions remain active during daytime operational windows.”

What specific M5 motorway sections are affected?

As reported by local media outlets monitoring highway operations, the M5 motorway—the primary north-south artery through Bristol and Somerset—will feature four separate night-time work zones.

These operations include essential structural upkeep, resurfacing trials, barrier safety repairs, and routine drainage works. Highway authorities have advised motorists that while carriageway closures are restricted to overnight hours (typically 8:00 PM to 6:00 AM), early morning commuters starting journeys before 6:00 AM may encounter active diversion routes.

What is the background behind the South West motorway maintenance work?

The current schedule of overnight closures across Bristol and the wider South West forms part of National Highways’ broader multi-million-pound cyclic maintenance and structural upgrade framework. The M48 Severn Bridge, originally opened in 1966, requires frequent structural monitoring, cable inspections, and specialized thin-layer resurfacing trials due to its narrow original deck design. Because the road surface on the M48 is narrower than modern motorways, full carriageway closures are frequently required to ensure safe working conditions for maintenance crews.

Simultaneously, the M5 corridor through Gloucestershire, Bristol, and Somerset undergoes regular seasonal maintenance—including gantry updates, concrete barrier repairs, bridge joint replacement, and carriageway resurfacing—to accommodate high summer traffic volumes. Transport authorities routinely condense these major works into night-time periods to prevent severe daytime congestion across the region’s main tourist and commercial links.

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How will these overnight motorway closures affect South West drivers and businesses?

The planned overnight closures on Thursday, August 6, will directly impact late-night commuters, freight hauliers, shift workers, and holidaymakers traveling through the South West corridor.

Impact on airport transfers and cross-border commuters

Travelers heading to Bristol Airport or moving between South Wales and South Gloucestershire overnight face extended journey times. Cross-border motorists using the M48 will need to factor in the detour across the M4 Prince of Wales Bridge, adding between 10 to 20 minutes depending on local junction traffic.

Impact on logistics and regional freight operators

Commercial haulage companies reliant on the M5 and M4/M48 networks for nocturnal deliveries across England and Wales will experience minor scheduling delays. Fleet operators are advised to review official National Highways diversion maps and instruct drivers to adjust route timings to accommodate the 8:00 PM to 6:00 AM closure windows.