The road measures 13.23 miles long and would take a car obeying speed limits 59 minutes to travel its length.
The A400 is a A Road and is located in the Zone 4 Highways Region.
This is a true long-distance route, journeying through numerous towns like Fitzrovia, Somers Town, Bloomsbury, St Giles, Regents Park, Camden Town, Kentish Town, Upper Holloway, Soho, Covent Garden, Whitehall, and Embankment.
The road connects Greater London and Greater London.