The A4180 is a medium-length A-road in west London. It was originally the northern end of the B455.
The route starts at a roundabout on the A312 to the north of Yeading. It heads northwestwards along Ruislip Road. Although we're in London this road isn't residential: it starts off as a distributor running between housing estates before bending to the right to pass between two golf courses. It's also a TfL red route as it cuts off the southwest corner between the A312 and A40, which road is met at the next roundabout, the Polish War Memorial, named after the memorial at its northwest corner.
West End Road in South Ruislip
On the far side of the roundabout we continue along West End Road, which is non-primary and lined with houses. There's a brief "rural" section as we skirt the edge of Northolt Aerodrome, after which we go under the Central Line by Ruislip Gardens station. We continue through the actual suburb of Ruislip Gardens, lined with suburban semis, then the road detours to the west before rejoining its original alignment to go over the Metropolitan and Piccadilly Lines near Ruislip station. The road then continues along Ruislip High Street.
The B466 comes in from the left for a short multiplex, leaving at a mini-roundabout at the far end of the High Street. We then cross the green space that surrounds the River Pinn and continue north along Bury Street. We soon start to climb Ducks Hill Road and enter open country (or, more accurately, Ruislip Common). The road is wooded for a short distance, after which we reach the settlement of Ducks Hill: scattered houses set back from the road which draw us slowly back into suburbia.
The road soon becomes lined with houses once more and then we descend to pass Denville Hall (an actors' retirement home). The road continues north for a short distance before bearing right to end at traffic lights on the A404.