Originally a roundabout, Western Circus became known as Savoy Circus, when the Savoy cinema opened at the junction in 1931. East of this point is the
Westway, part of the A40 Central London link to
Paddington. After Savoy Circus, the dual carriageway takes a bend towards
North Acton, crossing the
North London line and the
Great Western Main Line. The first major junction is
Gypsy Corner (with the A4000, ), connecting northwards to
Park Royal and
Harlesden and southwards to
Acton town centre. Starting with the
Hanger Lane Gyratory System (with the
A406 and
A4005, ); this is followed by a junction with the (
B452) at
Perivale (), connecting southwards to
West Ealing and the
River Thames at
Kew Bridge; the
Greenford Roundabout (with the A4127, ), connecting northwards to
Harrow and southwards to
Southall; the Target Roundabout (with the
A312, ), a junction for
Heathrow Airport; and the
Polish War Memorial junction (with the A4180, ) for
RAF Northolt. In the final few miles of the road, there are minor junctions with the A437 (Hillingdon Circus) to
Ruislip and
Hillingdon, and with the B467 (Swakeleys Roundabout) to
Uxbridge, before the road ends at the junction with the
M40 at the
Denham Roundabout, northwest of Uxbridge. ==Air crash==