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The Denham Roundabout is a road junction in Denham, Buckinghamshire. It was originally opened in 1943 in conjunction with the completion of the new Western Avenue route into west London. The Western Avenue took over the classification of the A40, with the previous route to London, via Uxbridge and Ealing, being reclassified as the A4020. The roundabout also included a new link to A412 that formed part of the outer London orbital route.
Since 1973, the westbound A40, now flows into the M40 motorway at this point. The roundabout below facilitates junction 1 (J1) of the motorway to connect with the westbound continuation of the A40, together with the intersection of the road from Uxbridge (A4020) and the road from Slough to Watford (A412). [1]
When the M40 from Denham to High Wycombe was built, Western Avenue was extended at high level to make an end-on join with the motorway, and a larger roundabout was built below the bridges carrying the motorway. When first laid out, the roundabout had the traffic going round it clockwise in the usual way, but as traffic volumes built up, the layout was altered so that the traffic moved round the roundabout in both directions, making it a ring junction with roundabouts at the points that other roads join the main roundabout. [2]
The M40 motorway links London, Oxford, and Birmingham in England, a distance of approximately 89 miles (143 km).
Shepherd's Bush is a suburb of West London, England, within the London Borough of Hammersmith and Fulham 4.9 miles (7.9 km) west of Charing Cross, and identified as a major metropolitan centre in the London Plan.
The A40 is a trunk road which runs between London and Goodwick (Fishguard), Wales, and officially called The London to Fishguard Trunk Road (A40) in all legal documents and Acts. Much of its length within England has been superseded by motorways, such as the M40, and has lost its trunk road status, though it retains it west of Gloucester, including its length within Wales. It is approximately 260 miles (420 km) long. The eastern section from Denham, Buckinghamshire to Wheatley, Oxfordshire is better served by the M40 and its former function of linking London with Cheltenham and Gloucester has been taken by the M4, A419 and A417 via Swindon.
The Westway is a 2.5-mile (4 km) elevated dual carriageway section of the A40 trunk road in West London running from Paddington in the east to North Kensington in the west. It connects the London Inner Ring Road to the West London suburbs.
The A4 is a major road in England from Central London to Avonmouth via Heathrow Airport, Reading, Bath and Bristol. It is historically known as the Bath Road with newer sections including the Great West Road and Portway. The road was once the main route from London to Bath, Bristol and the west of England and formed, after the A40, the second main western artery from London.
The A46 is a major A road in England. It starts east of Bath, Somerset and ends in Cleethorpes, Lincolnshire, but it does not form a continuous route. Large portions of the old road have been lost, bypassed, or replaced by motorway development. Between Leicester and Lincoln the road follows the course of the Roman Fosse Way, but between Bath and Leicester, two cities also linked by the Fosse Way, it follows a more westerly course.
Denham is a village and civil parish in the unitary authority of Buckinghamshire, England, approximately 17 mi from central London, 2 mi northwest of Uxbridge and just north of junction 1 of the M40 motorway. The name is derived from the Old English for "homestead in a valley". It was listed in the Domesday Book of 1086 as Deneham. Denham contains the Buckinghamshire Golf Club.
Western Avenue is part of the A40, a major road running in a north-westerly direction out of London. Western Avenue is approximately 10 miles (16 km) long from its junction with Old Oak Common Lane in East Acton.
"The Magic Roundabout" in Hemel Hempstead, Hertfordshire, England, is the familiar name given to the Plough Roundabout. The familiar name comes from the children's television programme, and is also used for a similar junction in Swindon, the M40 junction in Denham, and the Magic Roundabout in Colchester. The official name relates to a former public house, called The Plough Inn, which was between the junction of what is now Selden Hill and St Albans Road. It has also been known as the Moor End Roundabout as it is adjacent to the part of Boxmoor nearest the town. Before Hemel Hempstead became a new town the roads met in a simple junction which was then replaced by a standard roundabout.
The West Cross Route (WCR) is a 0.75-mile-long (1.21 km) segment of dual carriageway of the A3220 route in West London running north–south between the northern elevated roundabout junction with the western end of Westway (A40) and the southern Holland Park Roundabout. It runs through Shepherd's Bush to its west and Notting Hill to its east.
Uxbridge Road is the name of the A4020 road in West London. The 12-mile (19 km) route starts at Shepherd's Bush Green and goes west towards Uxbridge. It passes through Acton, Ealing, Hanwell, Southall, Hayes, and Hillingdon.
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.
The A329 is an east–west road in Southern England that runs from Wentworth in Surrey to Thame in Oxfordshire.
The A3220 is a primary A road in London, England. It runs north from Clapham Common to the A40 Westway at Ladbroke Grove.
The Wycombe Railway was a British railway between Maidenhead and Oxford that connected with the Great Western Railway at both ends; there was one branch, to Aylesbury.
A roundabout interchange is a type of interchange between a controlled access highway, such as a motorway or freeway, and a minor road. The slip roads to and from the motorway carriageways converge at a single roundabout, which is grade-separated from the motorway lanes with bridges.
The Magic Roundabout in High Wycombe, Buckinghamshire, England, is similar to the complex roundabouts in Hemel Hempstead and other places. It is located on the junction of the A40 and A404 roads.
The A40 is a major trunk road connecting London to Fishguard, Wales. The A40 in London starts in the City of London and passes through six London Boroughs: Camden, Westminster, Kensington & Chelsea, Hammersmith & Fulham, Ealing and Hillingdon, to meet the M40 motorway junction 1 at Denham, Buckinghamshire.
The A4010 is an important primary north–south road in Buckinghamshire, Southern England. It runs from High Wycombe at Junction 4 of the M40 motorway to Stoke Mandeville, near Aylesbury on the A413.
Handy Cross roundabout is a major road interchange at Handy Cross, High Wycombe, Buckinghamshire; the junction for High Wycombe, the M40 motorway and the A404 dual-carriageway. It is the terminus of the A4010 which runs to Aylesbury.
51°33′40″N0°29′46″W / 51.561°N 0.496°W