Sunday, 1 December 2013

River Colne Denham Roundabout

River Colne
The Colne flows southwards
TQ 04038 85724

Huge motorway roundabout on the M40 with some associated main road buildings


Post to the south New Denham
Post to the east Willowbank
Post to the north Denham

Denham Road
A412 This road reaches the roundabout from Slough. Before the M25 was built it continued to St Albans. It now meets the A40 and M40 at the Denham Roundabout. Although the road appears to terminate here at the roundabout in fact it resumes north on the A40 en route to Watford.

Knighton Way
Knighton Way Lane Primary School. The school was opened in 1918 and closed and demolished in 1984.  There is now housing on the site.

M40
This stretch was originally Gerrards Cross bypass was built in 1973. This was the last section of the Buckinghamshire part of the road to be built. The contractor was Amey Asphalt/Leonard Fairclough (AMEC) consortium. An innovation in it was that the concrete surface of the carriageways were finished by a special machine to produce transverse grooves, for high-speed skid resistance and to ensure fast dispersal of surface water. They were also designed to eliminate the high-pitched whine of tyres on concrete. The construction of the embankment here as the road approaches the roundabout was the subject of studies by the Transport and Road Research Laboratory in regard to the moisture retaining clay soil.

Oxford Road
Denham Roundabout. At the roundabout the A40 coming from London as Western Avenue emerges as the M40 motorway. It connects this with Denham Road as the A412 and the older A40 coming from Uxbridge as the A4020 and continuing to Amersham as the A40 Oxford Road. The roundabout is very large and was built to accommodate more slip roads planned as part of the never completed ringway systems.  When the roundabout was first built in the early 1970s traffic went round it in a conventional clockwise manner but because of its size there were problems with excessive speeding round it. It was therefore altered so that traffic went round in both directions via a series of smaller roundabouts at each intersection – not unlike the ‘magic roundabouts’ found nearby at older junctions in the area – and has been called ‘the magic gryatory’.  A parallel slip road exists on the south side of the main western slip onto the M40, this, the size of the overbridge and unused land around the roundabout suggest that it was built to accommodate extra road capacity then not approved and never actually built. The structures in areas under the motorway above were designed to be a contrast to the overbridges, and were to be seen by pedestrians and thus built to a single-span for aesthetic reasons.
Footbridges. There are three footbridges over the Denham Roundabout. They are of steel box-girder construction with helical ramps and were made by the Butterley Engineering Company. The superstructure was carried on circular steel columns supported on mass concrete column bases
96 Lambert Arms. This is now the Indian Summer restaurant
Ivy House Farm
Denham United Ladies Football Ground. The club was originally Drayton Wanderers formed in 1987 with a group of under 10 year old girls. They started in ladies football in 1995 gaining promotion every year
New Denham and Willowbank Community Centre.  A wide range of events are held here.
St. Francis Chapel. Church of England.
74 Tiger Cubs. Indian Restaurant. This was the Dog and Duck and the site of a Tollgate on the turnpike road. It is a 17th timber framed building. There is said to be a Dog and Duck modelled in plaster on the front but it may now be covered by a poster and sign.

Sources
British listed Buildings. Web site
CRBD. Web site
Denham Ladies United Football Club. Web site.
Denham Roundabout. Wikipedia. Web site
Friends Reunited. Web site
Motorway Archive
Sabre Roaders Digest. Web site.

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