National Highways has warned motorists of weekend closures of the M25 and A3 planned for February and March.

The disruption is part of an ongoing upgrade project at Junction 10, one of the country's busiest interchanges, notorious for its heavy daily congestion and high collision rate.

The improvement work, catering to around 270,000 daily users, promises a smoother traffic flow and reduced accidents, by an estimated third, at this critical junction.

The first closure takes place from 9pm on Friday, February 23 until 6am on Monday, February 26.

This will impact the full carriageway of A3, both directions, between Send and Junction 10 (Wisley).

A similar closure is scheduled for the M25, between junction 11 (Chertsey Interchange) and junction 10 (Wisley), from 9pm on Friday, March 15 until 6am on Monday, March 18.

Both of these closures involve bridge demolition work.

Mr Jonathan Wade, Senior Project Manager for National Highways M25 J10 upgrade, said: "A key element of our upgrade at junction 10 is the installation of eight new bridges – either replacements or new structures entirely.

"As we enter a new phase for the project, we’ll ramp up our work on these structures with a number of demolitions and installation the bridge beams at different locations."

The scheme also includes extensive environmental work set to be carried out by National Highways.

More than 25 hectares of heathland is expected to be restored, with new woodland set to be planted.

Mr Wade said: "We understand the significance of closing the M25 for the weekend, which is why we are giving motorists as much notice as possible so they’re able to plan their journeys well in advance.

"Our message for anyone who plans to travel on the M25 or the A3 is to avoid the area if you can – if that's not possible, allow yourself extra time to complete your journey via our signed diversion routes."

Motorists are urged to follow any updates on the National Highways website and understand that plans may change due to events such as adverse weather.

The entire M25 Junction 10 project is set to conclude in the summer of 2025.