The A4005 is a suburban link road running between Hanger Lane roundabout, where the A40

A40 road

The A40 is a major trunk road connecting London to Fishguard, Wales and officially called The London to Fishguard Trunk Road in all legal documents and Acts...

 meets the A406

A406 road

The A406 or the North Circular Road is a road which crosses North London, UK, linking West and East London. It, together with the South Circular Road, forms a ring road through the inner part of Outer London...

 (North Circular Road), and Harrow

Harrow, London

Harrow is an area in the London Borough of Harrow, northwest London, United Kingdom. It is a suburban area and is situated 12.2 miles northwest of Charing Cross...

. The A4005 now runs along Roxeth Hill to its junction with the A312 in South Harrow

South Harrow

South Harrow has grown out of the village of Roxeth as a result of urbanization and easier access from Central London by rail. South of the old village centre , and beyond the newly developed shopping area, lies South Harrow tube station and the High Street .-History:Much of the local history,...

, then merges with it northbound until its junction with the A404

A404 road

The A404 is a road in the United Kingdom that starts at Paddington in London and leads to Maidenhead in Berkshire.The road initially follows a course through London and its suburbs including Harlesden, Wembley, Harrow Pinner, and Rickmansworth...

 before splitting away again to become Greenhill Way. Formerly the road passed the junction with Roxeth Hill, crossing the A404

A404 road

The A404 is a road in the United Kingdom that starts at Paddington in London and leads to Maidenhead in Berkshire.The road initially follows a course through London and its suburbs including Harlesden, Wembley, Harrow Pinner, and Rickmansworth...

, continuing past Harrow-on-the-Hill station and joining the A409 at a point just south of the present junction.