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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M25 and A282Officially named the London Orbital, nicknamed the 'Road to Hell', and frequently derided as nothing more than a very big car park, this is the world famous and rightly notorious M25.
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.
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.
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.
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.
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.