For many in Berkshire and beyond, the M4 motorway is more than just tarmac and traffic—it’s a lifeline. But over two consecutive days in mid-February 2026, this critical artery linking London to South Wales faced a double dose of disruption, leaving commuters, business travelers, and holidaymakers scrambling for alternatives and patience wearing thin.
It all started in the early hours of Tuesday, February 17, when the humdrum of pre-dawn traffic was shattered by a high-speed police pursuit. According to the Metropolitan Police, officers attempted to stop a vehicle on the A4 at the junction with Earl’s Court Road in London at around 03:15 GMT. The driver, a man in his 30s, failed to comply, kicking off a chase that would soon spill onto the M4 westbound, just before junction 10 near Reading. The pursuit came to a dramatic halt when the fleeing vehicle crashed—bringing traffic to a standstill and setting off a chain reaction of closures and delays.
During the chase, the suspect reportedly rammed a police car, causing it to swerve and lose a tyre. The Metropolitan Police later confirmed the details: “During the pursuit, the driver rammed a police car, causing it to swerve and lose a tyre.” The man was arrested at the scene on suspicion of a host of offenses, including dangerous driving, attempted grievous bodily harm, driving on false plates, possession of a bladed weapon, failing to stop for police, and driving through a red light. He was promptly taken to hospital by the South Central Ambulance Service, where his injuries were assessed as non-life-threatening and non-life-changing. He remained in hospital, with plans to transfer him to police custody once cleared medically.
The aftermath of the crash was far from routine. National Highways responded by closing the westbound carriageway between junction 10 (Winnersh Interchange) and junction 11 (Three Mile Cross Interchange). The closure, which began around 5am, was initially expected to last for several hours. As reported by BBC and local outlets, a fuel spillage from the collision affected all lanes and damaged the nearside barrier, requiring immediate cleanup and repairs. Thames Valley Police and emergency crews worked through the morning and afternoon, while drivers were advised to leave the M4 at junction 10 and use the A329(M) or local roads like the B3270 instead. Congestion quickly built up, with one mile of tailbacks reported on approach to the closure and delays stretching toward junction 9 for Maidenhead.
National Highways kept the public updated throughout the day, noting, “If this closure impacts on your planned route, please allow extra journey time. Plan ahead, you may wish to re-route or even delay your journey.” By late afternoon, recovery crews were installing lane closures and beginning to lift the full closure, but lanes 1 and 2 remained shut for emergency resurfacing. The westbound entry slip from the A329(M) northbound also stayed closed, with a full carriageway closure expected overnight to finish the resurfacing work. For those who rely on the M4, it was a day of frustration and forced detours.
But just as the dust began to settle on the crash and its aftermath, a second—and entirely unrelated—emergency brought the M4 to a standstill once again. On Wednesday, February 18, National Highways announced a full closure of the motorway in both directions between junction 10 (Wokingham/Bracknell) and junction 11 (Reading/Basingstoke) due to urgent repairs on a high-voltage power line pylon adjacent to the road. According to a National Highways spokesperson, the closure followed the discovery of structural damage to the pylon, and Scottish and Southern Electricity Networks (SSEN) crews were dispatched for critical repairs ahead of forecast strong winds later that evening.
The scale and urgency of the operation were not lost on officials or travelers. As reported by BBC and other outlets, the emergency works required specialized high-voltage safety procedures and heavy equipment—no small feat when the safety of both the national grid and the motorway was at stake. National Highways outlined diversion routes for both eastbound and westbound traffic, urging drivers to allow extra travel time, consider alternative journeys, or delay non-essential trips until the repairs were complete. “There are expected to be long delays also on local roads in the area of the closure,” warned a National Highways spokesperson.
The impact was immediate and widespread. Congestion stretched westbound toward junctions 8 and 9 near Maidenhead and eastbound back toward junction 12 (Theale). Commuters, holidaymakers, and business travelers all felt the pinch. Those heading to Heathrow Airport, Reading’s business hubs, or destinations further west like Bristol, Bath, or Cardiff faced prolonged travel times and missed appointments. Local media offered practical tips—switch to Great Western Railway trains from Reading or Wokingham if possible, monitor travel apps and social media for updates, and, if you can, just stay put until the road reopens. National Highways emphasized the importance of these repairs: “Closure expected to be in place for a substantial period of time.”
Despite the back-to-back disruptions, officials were quick to clarify that there was no connection between the two incidents. The crash and subsequent closure on February 17 were entirely separate from the pylon emergency that shut the motorway on February 18. As National Highways confirmed, one was a consequence of dangerous driving and a high-speed chase, while the other was a matter of public safety and infrastructure integrity.
For those caught in the chaos, the experience was a stark reminder of how interdependent the UK’s road and utility networks have become. High-voltage transmission towers often run alongside major motorways for accessibility, but any sign of instability can trigger widespread disruption. Emergency closures, while inconvenient, are sometimes the only way to prevent far more serious incidents—whether it’s a power outage, a road collapse, or worse.
As of Wednesday afternoon, crews continued their round-the-clock repairs, with National Highways and SSEN working in tandem to restore both the motorway and the power infrastructure. Diversion signs, flashing warnings, and travel bulletins remained the order of the day. Motorists were left hoping for a swift resolution—and perhaps a bit more luck on their next journey along the M4.
These two days of disruption on one of Britain’s busiest motorways underscore just how quickly a routine commute can unravel, and how vital it is for authorities, emergency services, and travelers themselves to stay flexible and well-informed when the unexpected strikes.