What is the longest distance between junctions on the M25?

because you'll have to travel for another 18 miles on the M25 before you can turn back. That 18 mile stretch between turnoffs is the longest distance between junctions on any of the UK's many motorways, making this infamous road the worst place in the UK to take a wrong turn.



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Junction 23 on the M25 in Hertfordshire is the single biggest gyratory on the whole of the National Highways network. At about 1.2km in circumference, the junction sees some of the highest traffic flows on the M25.

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Traffic. Near Heathrow Airport, the M25 is six lanes wide in each direction. The M25 is one of Europe's busiest motorways.

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Junctions and services The M25 has been criticised for having too many junctions; 14 of them serve only local roads. In 2016, Edmund King, president of the Automobile Association, attributed congestion on the M25 to excessive junctions.

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How the M25 got its name. The same principle explains the M25, which at its oldest point (the section crossing Surrey) follows the path of the older A25. These roads are all in the South East, which forms Zone 2 of the country's motorway system. This explains why they all contain 2 somewhere in their name.

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We first calibrated our milometers to make certain they read the same distance for a stretch of road, and then I drove clockwise and my friend anti-clockwise on the M25. Our starting and finishing point was the South Mimms service station. The result was surprising: clockwise 120.30 miles, anti-clockwise 120.80 miles.

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Magic Roundabout, Swindon The Magic Roundabout is often listed as one of the most intimidating junctions in the UK. It's best shown in map form so you can see the complexity of its one-way systems feeding five roundabouts.

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Firstly, I had to plan the route. All I knew was that it would make sense to start and finish at the Dartford Crossing, although at the time I didn't realise that pedestrians couldn't walk across the bridge. The M25 motorway circles London but because it is a motorway, you can't actually walk on the M25 itself.

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Junction 10 is the busiest section of the M25, with over 270,000 vehicles travelling through it every day. Due to the volume of traffic and the resulting queues, this area of their network has a very poor safety record and holds one of the highest collision rates across the National Highways network.

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