In 2017, Highways England held a consultation on improvements to Junction 10 (where the A3 meets the M25 near Cobham. The improvements are needed as there are long queues at peak hours (where traffic joins and leaves the M25) and a high level of accidents. The consultation favoured two options:
- OPTION 14: high level flyovers taking traffic from the A3 over the existing roundabout and onto the M25 to Heathrow and over the top to the M25 heading to the east.
- OPTION 9: a replacement for the existing roundabout to provide higher capacity. Highways England chose Option 14, but has made enhancements in response to views which arose from the consultation.
It has enhanced its new roundabout scheme and provided dedicated left turns onto and off the M25. They have avoided the need to take land from RHS Wisley and have enhanced the traffic flow off the A3 at the Painshill junction.
This scheme aims to alleviate long queues, reduce accidents and encourage traffic from the north to use the A3 and the improved junction instead of cutting through Weybridge, Cobham and Esher. The construction is planned to start in 2020/21.
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