This article is about an early route numbered A3063 near Windsor.
For the current A3063 near Hounslow, see A3063
.For the original A3063, which was the pre Kingston Bypass A3, see A3063 (Kingston)
Approaching Datchet on the B3021
The A3063 was not in the original 1922 Road Lists (its number then was B3021), but came into being a few years later. It left the A308 and ran around the east of Windsor Home Park, crossed the Thames, and finished on what was then the A331 in Datchet.
In 1935, it was renumbered as an extension of the A328. However, it has since been downgraded to the B3021, so receiving its original number back.