The Chiltern scarp, also known as the Chiltern Gap, is a steep slope on either side of the M40 motorway, approximately 7 miles (11 km) from Beaconsfield in south central England. The M40 in Warwickshire The M40 motorway is the second motorway in the English transport network to connect London to Birmingham. ... Location within the British Isles Beaconsfield is a market town in Buckinghamshire, England, about 30 miles NW of London. ... Royal motto (French): Dieu et mon droit (Translated: God and my right) Englands location (dark green) within the British Isles Languages English (de facto) Capital London de facto Largest city London Area – Total Ranked 1st UK 130,395 km² Population – Total (mid-2004) – Total (2001 Census) – Density Ranked 1st...

Owing to its natural formation, the motorway also has to curve slightly to get through. It is well known for making people's ears "pop" as they travel through.

There are notable changes in various weather conditions on either side of the scarp. Drivers can face bright sunshine and clear conditions on the north side, before hitting rain and low cloud on the other, or vice versa.