M25 junction 10 to junction 16 smart motorway
We’re working up smart motorway design options for this busy stretch of the M25.
On 12 January 2022 the Government’s response to the Transport Select Committee’s inquiry into the roll out and safety of smart motorways was published. It included a commitment to pause the rollout of future all lane running (ALR) smart motorway schemes until a full five years’ worth of safety and economic data is available from upgrades delivered before 2020.
The M25 junctions 10-16 upgrade is one of the schemes being paused.
We have deferred the project to upgrade the M25 between junctions 10 and 16 because we have determined that as it stands it would not provide good value for money for taxpayers.
We have made this decision after reviewing updated traffic modelling data and the expected costs of the project. We are continuing to look for ways to tackle congestion on this extremely busy section of motorway.
In 2014 the government announced the preferred solution for this stretch of the M25 was to upgrade it to a smart motorway. This means the existing hard shoulder would be converted into a traffic lane so there would be five lanes between junctions 15 and 16 and four lanes elsewhere and there’d be emergency access areas instead of the hard shoulder.
This section of the M25 has the highest traffic flows of any motorway in England. More than 200,000 vehicles use this stretch every day. Where the M25 connects with the M4 and the M40 between junction 15 and 16 is particularly busy as is junction 14 which connects directly with Heathrow Airport.
By converting this stretch to a smart motorway the flow of traffic can be better controlled and there will be less congestion and fewer delays. Upgrading the stretch will also create more capacity.