The present A1 runs along the following roads, from South to North:
Here it originally continued North up the Great North Road (now A1000), but the present A1 runs West, along
After a short distance it forks right onto the Great North Way NW4 to Hendon. There is an overpass onto the M1 and it continues as the Barnet By-Pass
The following websites contain more information:
Back to the first A1 from London.
Oliver Merrington, May 2002.