A1 London - Peterborough
From Roader's Digest: The SABRE Wiki
Route in Detail
From the heart of the capital, the central London part of the A1 has remained unchanged since the creation of the classified road system in 1922. One key change being the diversion of the original A1 from what is now the A1000 to Multiplex along the A406 and follow a new route through Barnet,
Jct 1 to 10 - Opened in stages as motorway between 1962 and 1986, the first real taste of the open road heading north forms bypasses for Hatfield, Welwyn Garden City, Stevenage, Letchworth and Baldock.
Jct 10 to 14 - Relatively unimproved stretch of the A1, awaiting a significant change with the future upgrade to the A14 nearby.
Jct 14 to 17 - Known for being perhaps the only really over engineered motorway in the country, the DBFO project between the A14 and Peterborough formed part of a bigger vision for upgrading the A1 to a full motorway, that stalled on completion of this section in 1998