a northbound direction. From Green Park, the A4 enters a short tunnel under Hyde Park Corner, where Wellington Arch is located. Afterwards, the road continues along the first part of Knightsbridge, before bearing left onto Brompton Road. This is an affluent area of London, in which the Harrods and Harvey Nichols department stores are located as well as numerous embassies. At this point, the road enters the Royal Borough of Kensington and Chelsea. At the Brompton Oratory, the road bears right along Thurloe Place and Cromwell Gardens, past the Victoria and Albert Museum and the Ismaili Centre, and onto Cromwell Road, past the Natural History Museum. At Earls Court, the A4 becomes dual carriageway, and continues along West Cromwell Road, over the West London Line into West Kensington and the Borough of Hammersmith and Fulham. A section of the road from Knightsbridge to the Chiswick Flyover was the first section of Clearway designated in London. It introduced no stopping on the road during rush hours on 21 August 1961. Hammersmith to Heathrow Airport (10.7 miles) The A4 continues along Talgarth Road past the London Academy of Music and Dramatic Art. The road becomes elevated at the Hammersmith Flyover and heads towards Heathrow Airport as the Great West Road, passing Hammersmith's two churches of St Paul and St Peter. At this point the road is close to the River Thames. The road enters Chiswick and the Borough of Hounslow, passing Fuller's Brewery. After Hogarth Roundabout, the road passes Hogarth's House and is called Hogarth Lane, then Ellesmere Road and Cedars Road. It becomes the Great West Road again just a few yards short of the start of Chiswick Flyover, which is junction 1 of the M4. Gunnersbury's Russian Orthodox Cathedral is clearly visible on the right. The next major intersection is Chiswick Roundabout, which is the junction for both the North and South Circular Roads. The road then passes the Glaxo-Smith Kline premises in Brentford where it follows underneath its successor the M4 as far as the bridge over the River Brent. The stretch between Chiswick's western border to Syon Lane (Gillette Corner) is known as the Golden Mile with some notable Art Deco factories. The road remains as the Great West Road through Osterley and Hounslow where it splits with the A30, which is known as the Great South West Road. Between the two world wars, the Great West Road