The road heads west through the City of Westminster via the Strand, passing notable landmarks such as the Royal Courts of Justice, the Savoy and Adelphi theatres, and Charing Cross railway station.

From Charing Cross station to Green Park, the westbound and eastbound routes of the A4 are considerably different, due to one-way systems.
Westbound, the A4 continues along the Strand up to Charing Cross itself, then along Cockspur Street and into Pall Mall, the location of many exclusive gentlemen's clubs as well as the Institute of Directors, before turning right along St James's Street to reach Piccadilly.

Eastbound from Green Park, the A4 runs along the full length of Piccadilly to Piccadilly Circus, before turning right along Haymarket.
It bears left along Pall Mall East, then right along the west side of Trafalgar Square, past the National Gallery and Canada House, to Charing Cross.
Finally, it bears left along the east side of the Square, past South Africa House, then right along Duncannon Street to reach Charing Cross station.

The first part of Regent Street, from Waterloo Place to Piccadilly Circus, is also signed as the A4; all traffic here runs in 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 5-mile (8.0 km) section of the road from Knightsbridge to the Chiswick Flyover was the first section of Cleaway designated in London.
It introduced no stopping on the road during rush hours on 21 August 1961.
The road heads west through the City of Westminster via the Strand, passing notable landmarks such as the Royal Courts of Justice, the Savoy and Adelphi theatres, and Charing Cross railway station.
From Charing Cross station to Green Park, the westbound and eastbound routes of the A4 are considerably different, due to one-way systems. Westbound, the A4 continues along the Strand up to Charing Cross itself, then along Cockspur Street and into Pall Mall, the location of many exclusive gentlemen's clubs as well as the Institute of Directors, before turning right along St James's Street to reach Piccadilly.
Eastbound from Green Park, the A4 runs along the full length of Piccadilly to Piccadilly Circus, before turning right along Haymarket. It bears left along Pall Mall East, then right along the west side of Trafalgar Square, past the National Gallery and Canada House, to Charing Cross. Finally, it bears left along the east side of the Square, past South Africa House, then right along Duncannon Street to reach Charing Cross station.
The first part of Regent Street, from Waterloo Place to Piccadilly Circus, is also signed as the A4; all traffic here runs in 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 5-mile (8.0 km) section of the road from Knightsbridge to the Chiswick Flyover was the first section of Cleaway designated in London. It introduced no stopping on the road during rush hours on 21 August 1961.
A4 road (England)