Today the M25 is 117 miles (187.2 km) long, and is the longest city bypass in the world.
Its radius varies from 13 to 22 miles (20.8 to 35.2 km) from Charing Cross (London’s point zero).
The M25 has 33 junctions and 234 bridges over or under the motorway itself.
For the road surface alone contractors used more than 2 million tonnes of concrete and 3.5 million tonnes of ‘black top’.
Extensive landscaping involved the planning of more than 2.1 million trees and shrubs. Before the first spadeful of soil could be dug, the route had to go through public consultation and a series of 39 Public Inquiries lasting a total of more than 700 sitting days as it was to pass through an Area of Outstanding Beauty near Swanley and Sevenoaks.
The total cost of the motorway in 1986 was nearly £1,000 million. ….and today, most Londoners will tell you it is also the largest parking lot in the world!!!
Image Source: Google Maps