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A404
A404 Harrow Road, at junction with Chippenham Road on the left
Route information
Length	44.6 mi (71.8 km)
Major junctions
From	A40 (Westway) in Marylebone, London
Major intersections	A219 A406 A312 A410 A412 A413 A416 A355 A40 A308 A4 M25 M40 M4
To	A404(M) at Maidenhead
Location
Country	United Kingdom
Primary destinations	Wembley, Harrow, Northwood, Rickmansworth, Amersham, High Wycombe, Marlow
Road network
Roads in the United Kingdom Motorways A and B road zones
← A403 → A405

The A404 is a road in the United Kingdom that starts at Paddington in London and terminates near Maidenhead in Berkshire. It is 44.6 miles (71.8 km) long.

Route

The road initially follows a course through north-west London via Harlesden, Wembley, Harrow, Northwood and Rickmansworth. During this stage, it is known as Harrow Road. It crosses the M25 at Junction 18 at Chorleywood, crossing into Buckinghamshire and then continues towards Little Chalfont and Amersham.

Between Harrow and Amersham, the road closely follows the route of the London – Harrow-on-the-Hill – Aylesbury railway lines, The Chiltern Line from Marylebone, and runs near several stations along that line.

At Amersham Common, the road turns south-west and continues in that direction joining the Amersham by-pass (A413) for a short distance, and then proceeds towards High Wycombe. After passing through the town centre, and crossing the A40, it changes to a dual carriageway up the hill to the M40 Junction 4, and continues as a dual carriageway past Marlow and Bisham.

The road eventually becomes the A404(M) at Maidenhead Thicket. It then runs a short distance towards the M4 where the A404(M) finally terminates at Junction 8/9.

Harrow Road

The Harrow Road is an ancient route in North West London which runs from Paddington in a northwesterly direction towards Harrow. It is also the name given to the immediate surrounding area of Queens Park and Kensal Green, straddling the NW10, W10, W2 and W9 postcodes. With minor deviations in the 19th and 20th centuries, the route remains otherwise unaltered.

Harrow Road is also a ward of the City of Westminster. The population of this ward at the 2011 Census was 12,034.

History

By the 19th century, Harrow Road had become the main street in Paddington.

In the 20th century, many properties along Harrow Road were developed into high-rise social housing, though some 19th-century houses and commercial buildings north of the Paddington Basin were retained. These included Elgin Towers, constructed between 1966 and 1969, and demolished in 1994.

Cultural references

The 1950 film The Blue Lamp is set around Harrow Road and features it prominently.

In one version of the Bus Driver's Prayer, the line from The Lord's Prayer, "Hallowed be thy name" is replaced with "Harrow Road be thy name."

A404(M)

A404(M)
The northern end of the A404(M)
Route information
Maintained by National Highways
Length	2.4 mi (3.9 km)
Existed	1961–present
Major junctions
Northeast end	Maidenhead (west)
Major intersections	M4 motorway A308(M) motorway
Southwest end	M4 Junction 8/9
Location
Country	United Kingdom
Primary destinations	Maidenhead, (High Wycombe), (Henley), (Marlow)
Road network
Roads in the United Kingdom Motorways A and B road zones
← A329(M) → A627(M)

The A404(M) is a motorway in Berkshire, England and can be referred to as the Maidenhead and Marlow Bypass or M4/M40 link road. It joins the M4 with the A404 dual carriageway to High Wycombe, Marlow and the M40. It was originally known as the A423(M) until the A423 between Maidenhead and Oxford was reclassified as the A4130.

History

The road was originally opened in 1961, as part of the A4(M) Maidenhead Bypass, which ran from the existing Junction 7, through a junction with the A308 and ending at a junction with the A4. In 1963, the Slough bypass was opened to Junction 7, and the A4(M) was renumbered M4, Junction 8 being with the A308 and Junction 9 with the A4.

The proposed route of the M4 was then changed to go south of Reading, instead of north of it. When the M4 was extended in 1971, a new junction was provided to connect with what would become a spur. As this new interchange was built too close to the existing Junction 8, this had to be closed. A new spur, the A308(M), was built to maintain access to the A308 and connected with the A404(M) and the M4 at the same grade separated roundabout. This new junction was numbered 8/9 so as not to confuse motorists and the interchange with the A4 became Junction 9A. The old M4 was renumbered A423(M) as it was a direct continuation of the A423 to Oxford.

Junctions

This article contains a bulleted list or table of intersections which should be presented in a properly formatted junction table. Please consult this guideline for information on how to create one. Please improve this article if you can. (December 2021)

Information above gathered from Advanced Direction Signs April 2011

See also

• Roads portal

References

1. "M25 J18 Chorleywood Interchange". roads.org.uk. Retrieved 10 September 2022.
2. "M40 J4 Handy Cross". roads.org.uk. Retrieved 10 September 2022.
3. "Harrow Road, London". Google Maps. Retrieved 27 September 2022.
4. "A History of the County of Middlesex" 1989 – the road was not new in the 16th century
5. "City of Westminster Ward population 2011". Neighbourhood Statistics. Office for National Statistics. Retrieved 16 October 2016.
6. ^ Weinreb, Ben; Hibbert, Christopher; Keay, John; Keay, Julia (2008). The London Encyclopaedia (3rd ed.). Pan Macmillan. p. 387. ISBN 978-1-405-04924-5.
7. "Notes and Queries". The Guardian. London.
8. "M4 J8/9 Holyport Interchange". roads.org.uk. Retrieved 11 September 2022.
9. "A308(M)". roads.org.uk. Retrieved 11 September 2022.
10. ^ The Motorway Archive – M4 Dates Page Archived 4 January 2007 at the Wayback Machine
11. "A404(M) J9B Maidenhead Thicket Interchange". roads.org.uk. Retrieved 11 September 2022.
12. "A404(M) J9A Cox Green Interchange". roads.org.uk. Retrieved 11 September 2022.

External links

• Google Local satellite photo showing original route of the A4(M)/(M4).

v t e Motorways in the United Kingdom
Great Britain	M1 M11 M18 M180 M181 A1(M) A167(M) A194(M) A1077(M) M2 M20 M23 M25 M26 M27 M271 M275 M3 M32 A3(M) A38(M) A308(M) A329(M) M4 M40 M42 M45 M48 M49 A48(M) A404(M) M5 M50 M53 M54 M55 M56 M57 M58 A57(M) A58(M) M6 M6 Toll M60 M61 M62 M65 M66 M67 M69 M602 M606 M621 A64(M) A66(M) A627(M) M73 M74 M77 A74(M) M8 M80 M876 M898 A8(M) A823(M) M9 M90
Northern Ireland	M1 M2 M3 M5 M12 M22 A8(M)
Former	M10 M41 M63 M85 A18(M) A40(M) A41(M) A102(M) A601(M) A6144(M)
Unbuilt	M12 M15 M16 M31 M64 M4 relief road
Junctions ( Category)	Almondsbury Broxden Catthorpe Charing Cross, Glasgow Denton Island Handy Cross Longbridge Lydiate Ash Scotch Corner Spaghetti Junction Switch Island Thorney Thorpe Thurcroft
Bridges	Auchenshuggle Avonmouth Bromford Don Friarton Gathurst Kingston Medway to Nowhere Ouse Rakewood Scammonden Prince of Wales Severn Thames Thelwall Tinsley Queensferry Usk Weaver
Related articles	National Highways Traffic officers South Wales Trunk Road Agent Traffic officers Transport Scotland DfI Roads Preston By-pass Smart motorway Motorway service area List
Category Commons

v t e A roads in Zone 4 of the Great Britain road numbering scheme
	A4 A40 A41 A42 A43 A44 A45 A46 A47 A48 A49
	A400 A403 A404 A405 A406 A412 A413 A414 A415 A417 A418 A419 A420 A421 A422 A423 A426 A427 A428 A429 A431 A432 A433 A441 A442 A444 A445 A446 A448 A449 A452 A453 A454 A456 A458 A461 A465 A466 A468 A469 A470 A473 A474 A475 A476 A477 A478 A479 A482 A483 A485 A486 A487 A489 A490 A491 A493 A494 A496 A498 A499
	A4005 A4006 A4008 A4010 A4018 A4032 A4042 A4050 A4053 A4054 A4055 A4059 A4060 A4061 A4063 A4069 A4074 A4076 A4080 A4085 A4086 A4103 A4107 A4109 A4110 A4113 A4117 A4118 A4119 A4123 A4130 A4133 A4135 A4136 A4138 A4142 A4144 A4146 A4148 A4150 A4155 A4160 A4161 A4174 A4200 A4202 A4204 A4214 A4216 A4221 A4226 A4230 A4232 A4234 A4240 A4241 A4260 A4361 A4400 A4536 A4540
List of A roads in Zone 4 List of B roads in Zone 4

v t e Transport in Buckinghamshire
Road	Motorways M1 M4 M25 M40 A-roads A4 A40 A41 A404 A412 A413 A418 A421 A422 A428 A4010 A4012 A4146 A4155 A5 A508 A509 A5130 Roman roads Akeman Street Watling Street Notable junctions Handy Cross roundabout Denham Roundabout Magic Roundabout (High Wycombe) Motorway service stations Beaconsfield Newport Pagnell
Rail	Main lines West Coast Main Line Chiltern Main Line Great Western Main Line Other lines Marston Vale line London–Aylesbury line Metropolitan line Aylesbury–Princes Risborough line Marlow branch line Closed lines Varsity Line Great Central Main Line Banbury to Verney Junction branch line Brill Tramway Wycombe Railway Watlington and Princes Risborough Railway Cheddington to Aylesbury Line Aylesbury and Buckingham Railway Wolverton–Newport Pagnell line Bedford–Northampton line Other Chinnor and Princes Risborough Railway East West Rail Buckinghamshire Railway Centre Seer Green rail crash
Air	Denham Aerodrome Turweston Aerodrome Silverstone Heliport Wycombe Air Park
Waterways	Rivers River Thames River Great Ouse Canals Bedford & Milton Keynes Waterway (planned) Grand Union Canal Slough Arm Wendover Arm Aylesbury Arm
Footpaths	National Trails Thames Path The Ridgeway Long-distance footpaths Icknield Way (path) Chiltern Way Greater Ridgeway Midshires Way Ouse Valley Way Shakespeare's Way Swan's Way
Cycle paths	Route 4 Route 6 Route 51 Route 57
Related articles	v t e Transport in Milton Keynes Road Milton Keynes grid road system A421 A422 A4146 A5 A509 Watling Street (Roman road, "Old A5") Rail Bletchley Flyover Bletchley railway station Bletchley TMD Bow Brickhill railway station East West Rail Fenny Stratford railway station Marston Vale line Milton Keynes Central railway station Varsity Line West Coast Main Line Woburn Sands railway station Wolverton railway station Wolverton–Newport Pagnell line Wolverton and Stony Stratford Tramway Bus Buses in Milton Keynes Arriva Shires & Essex Milton Keynes Coachway MK Metro Stagecoach Midlands United Counties Omnibus Water Bedford & Milton Keynes Waterway (proposed) Cosgrove aqueduct Grand Union Canal Other transport Milton Keynes redway system (shared path network)

• Motorways in England
• Roads in Berkshire
• Roads in Buckinghamshire
• Roads in Hertfordshire
• Roads in London