A40 Views
It is one of the few remaining of the old trunk routes not to have been superseded by a direct motorway link, though some parts, such as the southern section from London to Oxford are now better served by the M40. Part of the A40 forms a section of the unsigned Euroroute E30, which the Welsh Assembly Government refers to as one of the lowest standard sections of the Trans European Road Network in the United Kingdom [1]
The first change dates from 1935, between Ross-on-Wye and Abergavenny. The original route of the A40 was via Skenfrith; this road was renumbered the B4521. The A40 was rerouted via Raglan; between Ross and Raglan it replaced part of the A48, between Raglan and Llanvihangel-nigh-Usk it replaced the B4234, and between Llanvihangel and Abergavenny it replaced part of the A471.
Subsequently, the A40 was rerouted within west London. Western Avenue dates from the 1930s, but was originally opened as the A403. After the Second World War, the A40 was rerouted along part of the A219 (west of Notting Hill) and Western Avenue. The old route (via Acton, Ealing, Southall, Hayes, Hillingdon and Uxbridge) was renumbered the A4020.
In central London, it forms High Holborn and Oxford Street. At Marble Arch it joins the A5 Edgware Road as far as the Marleybone Flyover to then form Westway, formerly classified A40(M) as an elevated motorway it has now been reduced back to 'A' road status. It takes the A40 to meet Western Avenue. With two exceptions, Western Avenue forms a grade-separated motorway standard dual-carriageway between Paddington (Westway) and the M40 motorway, which goes off towards Oxford and Birmingham. The two exceptions are Gypsy Corner and Savoy Circus, both of which cause the traffic to stop at traffic lights. For the greater part, the road is six lanes wide, with stretches of four lane road. At Denham Roundabout, the six lane Western Avenue becomes the M40.