A serious crash has caused major disruption on the M4 in Berkshire today, with the motorway closed in both directions between Junctions 8/9 at Maidenhead and Junction 10 near Reading.
Emergency services were called to the scene during the morning of September 10, 2026, following the collision. Thames Valley Police remain at the location while investigators work to establish what happened. National Highways traffic officers are also assisting with the closure and managing traffic around the incident.
The closure is expected to remain in place for several hours while the collision investigation continues. Motorists travelling through the area have been warned to expect disruption and allow additional time for their journeys. A diversion route has been established, with drivers being advised to follow the signed diversion rather than attempting to enter the closed section.
At the time of the latest update, authorities had not released confirmed information about the number of people involved, the extent of any injuries or the circumstances that led to the crash. Police are expected to provide further information as their investigation develops.
The affected stretch of the M4 is an important route between London, Berkshire and the west of England, meaning a prolonged closure during the morning rush could have wider effects on surrounding roads.
National Highways has urged drivers to check their journeys before travelling and to allow extra time because the investigation is expected to continue for several more hours.
The road will remain closed until emergency crews and investigators have completed their work and authorities determine that it is safe to reopen the carriageways.
