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Why is M25 so busy?

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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Gravelly Hill Interchange is the UK's busiest motorway junction and is one of the country's most iconic concrete structures which turned 50 last year. The winding labyrinth of roads along the M6 is also one of the biggest motorway interchanges in Europe and more than 200,000 vehicles travel on it daily.

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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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The 25 busiest sections of motorway
  • M25 J14 - J15 262,800.
  • M1 J7 - J8 197,200.
  • M60 J13 - J12 195,300.
  • M25 J13 - J14 186,900.
  • M25 J12 - J11 185,300.
  • M25 J18 - J19 177,400.
  • M25 J11 - J10 176,000.
  • M25 J16 - J15 174,900.


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well to be honest, Its always busy on the M25, and severely worse during the rush 6-10am, 3-7pm. 5am is a good time to start out but you'll still pick up conjestion further on. So expect the worse, and keep your fingers crossed, make sure you listen our for traffic alerts on the car radio.

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Hardknott Pass is considered to be one of the most challenging in the UK. It has earned this consideration due to its series of hairpin bends and the high risk of ice on the road. It is a steep, twisting, single-track road that cuts right through the heart of the Lake District between the Duddon Valley and Eskdale.

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Hanger Lane Gyratory – West London. Magic Roundabout – Swindon. Gravelly Hill Interchange (Spaghetti Junction) – Birmingham.

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Despite the upgrades, the A1(M) remains one of the most hazardous roads in the UK. In fact, it has earned the title of Britain's deadliest road, with collisions causing the deaths of 172 people over the past decade alone. Between 2007 and 2016, the road saw a total of 7,848 accidents involving 10,821 vehicles.

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At 231 miles (370km), the M6 is the UK's longest motorway. It runs from Catthorpe (junction 19 on the M1) to the Scottish Border. The M62 is the highest motorway in the UK. It reaches 1,220ft (372m) near the Pennine Way footbridge.

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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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