The highest placed ‘A-Road’ is the A14 between Cambridge and Peterborough.
A well researched document.
The A14 stops about 20 miles from Peterborough so they must be either using the latest Caterham 4x4 or the new A1M (Now thats a road)

4 lanes just a few bridges 70mph all the way

The A14 is one of the worse roads in the country which I use on a daily basis.
