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Coordinates: 51°33′40″N 0°29′46″W / 51.561°N 0.496°W

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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]

References

^ "M40 J1 Denham Roundabout". Roads.org.uk. Retrieved 26 January 2019.
^ "Denham Roundabout - Roader's Digest: The SABRE Wiki". www.sabre-roads.org.uk. Retrieved 26 January 2019.

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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

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

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)

51°33′40″N 0°29′46″W / 51.561°N 0.496°W / 51.561; -0.496

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