M1 near Elstree M25 near Abbots Langley M40 / A34 near Bicester M42 / A4141 near Solihull M5 in West Bromwich M54 near Tong The A41 is a trunk road between London and Birkenhead, England.

Now in parts replaced by motorways, it passes through or near Watford, Kings Langley, Hemel Hempstead, Aylesbury, Bicester, Solihull, Birmingham, West Bromwich, Wolverhampton, Newport, Whitchurch, Chester and Ellesmere Port.

The route begins at Marble Arch from its junction on the A40 road in London with Portman Street/Gloucester Place (northbound) and Baker Street/Orchard Street (southbound).

The road continues north, passing over the River Colne, to the east of Watford, crossing the A412 near Garston at "the Dome roundabout".

The London to Aylesbury section was a similar route to the Sparrows Herne Turnpike Road.

It climbs through the Chiltern Hills then descends into the valley of the River Bulbourne crossing water meadows just outside Hemel Hempstead at Boxmoor.

An arched footbridge spans the road just near the summit before it passes just east of Tring (for the Ridgeway footpath) and descends the Chiltern scarp into the Vale of Aylesbury.

It crosses the Grand Union Canal, and there is a junction with the B489, and finishes at a roundabout, becoming Aston Clinton Road.

At Kingswood, it passes the Crooked Billet (now the "Akeman Inn") and Plough and Anchor (now an Italian restaurant) pubs.

Since 1993, the road now heads south-west where it officially becomes part of the M40 at junction 9, meeting with the A34 (which also overlaps the M40 to Birmingham – to draw traffic off the previous routes).

From here to the M42, the original route is now mainly designated as the B4100 (multiplexing at points with the current A361 and A422 through Banbury, plus the A452 and A425 approaching and through Warwick) followed by the A4177 and A4141, the latter two both excellent wide roads.

The road manifests from the junction which opened in November 1976 with the A4141 and M42 near Berry Hall Farm, and crosses the River Blythe and bypasses Solihull.

It passes Archbishop Ilsley Catholic School at Acocks Green, then meets the B4146 and B4217 at a roundabout near a Sainsburys.

The two main routes overlap around central Birmingham and meet The Middleway (A4540) inner ring road.

Just before The Hawthorns football stadium, home of West Bromwich Albion F.C., it leaves Birmingham and enters the borough of Sandwell.

The new route opened in 1995 and is called the Black Country New Road, and crosses the West Midlands Metro tram line near Guns Village.

At the junction with the A4444 (the final phase of the Black Country New Road) it crosses the Walsall Canal.

The road goes straight through the middle of Bilston, where it meets the dual-carriageway A463 Black Country Route at a busy roundabout.

It overlaps the A4150 Wolverhampton Ring Road, then passes West Park Hospital and crosses the Staffordshire & Worcestershire Canal.

After leaving the borough of Wolverhampton, it crosses the River Penk, then runs into Staffordshire passing Perton, Codsall and the golf course at Wrottesley Hall.

The day before the bypass opened for traffic, a Hinstock local named David Williams flew his Saab 91D Safir airplane under the Pixley Lane bridge in an unsanctioned stunt.

The final stretch of the road leaves Shropshire and heads north through Cheshire on a modern alignment bypassing the villages of Tushingham cum Grindley and No Mans Heath before reaching a nineteenth century bypass of the stagecoach road through Broxton.

The road crosses the A534 at Broxton Roundabout before passing Beeston, Bolesworth and Peckforton Castles.

The original (1923) route was Stanmore north-west of London to Oakengates, west of Wolverhampton, in Shropshire, meeting the A5 at both ends.

The A41 was extended by numbering as follows: The northern extension dates from 1935; in Shropshire, it swapped with a combination of the A464/A529; from Kingswood Common to Nantwich, Cheshire and the original A529 ran from Hinstock to Chester.