August Bank Holiday: M25 and Euston Travel Forecast

By GlobeBids Travel Desk | Updated August 24, 2026

Drivers and rail passengers should prepare for heavier journeys during the August 29–31 Bank Holiday weekend, particularly on Friday afternoon and Monday evening. National Highways says major roadworks will pause where possible, but existing M25 lane closures will remain. Rail passengers using London Euston should watch for route-specific engineering changes before travelling.

When roads and trains are likely to be busiest

Friday, August 28 falls outside the formal holiday weekend but is likely to produce the first major getaway pressure. Commuter traffic will overlap with families and holidaymakers leaving after work, making Friday afternoon into evening the least flexible departure window.

The return peak is expected from late afternoon on Monday, August 31. Congestion could build earlier if poor weather encourages people to leave destinations at similar times. Collisions, breakdowns and short-notice rail changes may also alter conditions quickly.

These are planning windows rather than guaranteed hourly forecasts. Traffic levels will depend on weather, incidents and how many travellers change their departure times.

M25 lane closures may still create bottlenecks

National Highways reported on August 20 that major roadworks are scheduled to pause for the Bank Holiday, reducing the risk of additional planned restrictions. However, pre-existing M25 lane closures remain in effect, so traffic can still compress around affected junctions.

Drivers should inspect the whole journey instead of checking only the nearest M25 section. Congestion on an approach road can remove the advantage of an apparently faster motorway route.

Possible alternatives depend on the direction of travel. Routes involving the M11, A1(M), M40 or M4 may help some journeys avoid part of the orbital motorway, but none is a universal diversion. Compare live journey times before leaving and avoid following navigation apps through unsuitable residential roads.

A sensible road plan includes:

• Filling or charging the vehicle before the busiest departure period.
• Checking National Highways traffic information immediately before leaving.
• Allowing extra time for narrow lanes, reduced limits or queuing near restrictions.
• Keeping a second strategic route available if an incident blocks the first.

London Euston passengers should verify every connection

Planned engineering work is expected to affect rail journeys associated with London Euston during the weekend. The effect can differ by operator, destination and time, so passengers should not assume that every Euston service is cancelled—or that their normal connection will run unchanged.

Use the National Rail journey planner for the exact departure and inspect every leg of the itinerary. A journey shown as operating may still involve an earlier departure, a different London terminal, fewer direct trains or replacement transport.

Passengers considering Marylebone, St Pancras International or King’s Cross should use those stations only when an official journey option supports the alternative. Tickets are not automatically valid on every operator or route, and an improvised diversion can create extra cost or a missed connection.

If replacement buses are shown, allow time to find the departure point and transfer luggage. Travellers with accessibility requirements should contact the relevant operator because assistance arrangements can differ when trains are replaced.

Checks to make before leaving

Road conditions and rail plans can change close to departure. Check National Highways for live M25 incidents and restrictions, then confirm the complete rail itinerary through National Rail rather than relying on an older screenshot or saved journey.

For the lowest-stress option, avoid Friday afternoon and Monday evening where possible. Travellers who cannot move their departure should build in additional time, confirm ticket validity for any alternative route and repeat the final check shortly before setting out.

Source: National Highways