A403 (Western Avenue)
|A403 Western Avenue in Northolt|
|From:||White City (TQ231810)|
|Length:||13 miles (20.9 km)|
|Met:||A219, A404, A406, A312, A40|
|Now part of:||A40|
|Route outline (key)|
The A403 was originally allocated to Western Avenue, a new major arterial route from White City (near the former BBC Studios) to Uxbridge, providing a bypass of the heavily built up A40 Uxbridge Road. It opened (in stages) with this number (the road did not exist at all in 1922), though eventually its importance over the parallel older road was recognised, and according to the relevant Ten Mile Road Maps it was renumbered to A40 between 1939 and 1946 (with the latter date being most likely for obvious reasons), with the old A40 Uxbridge Road becoming the A4020.