Anyone who regularly travels around the western side of the M25 will know that the A3 junction near Wisley has been a congestion hot spot for many years. Traffic joining the M25 from the A3, or leaving it to get on the A3, results in traffic jams. Likewise queues can arise on the A3, partly because the roundabout at the junction contains traffic lights. Highways England have now published their preferred proposals to improve the situation.
There was an informal public consultation which considered several options, but Highways England have revised the one which proposed simply a larger roundabout so as to try to meet environmental concerns (RHS Wisley Gardens are very close by and there are ancient woodlands near the roads). That is the one they are proposing to put to a formal public consultation in early 2018. Prospective completion date might be as late as 2025.
More details are present here: https://highwaysengland.citizenspace.com/he/m25-junction-10-a3-wisley-interchange-improvement/
Comment: This junction is well overdue for improvement so the reaction of most motorists is likely to be that the sooner this is implemented, the better. The proposed solution does look like a reasonable compromise although the details of the traffic modelling would have been helpful. Perhaps we will see that in due course. Will the suggested design actually cope with the likely additional traffic flows around the M25, particularly if Heathrow airport is expanded? The proposed solution may provide only temporary relief and there will be considerable disruption while it is constructed.
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