This article is about the original A403 in West London that is now the A40.
For current road between Avonmouth and the M48, see A403
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, though eventually its importance over the parallel older road was recognised, and it was renumbered to A40 in the 1950s, with Uxbridge Road becoming the A4020.
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