TL1103 : Motorway bridges at M25 junction 21

taken 2 years ago, near to Bricket Wood, Hertfordshire, Great Britain

Motorway bridges at M25 junction 21
Motorway bridges at M25 junction 21
The overbridges carrying traffic at the intersection. The highest road is for traffic joining the M1 from the M25 anticlockwise. The lowest is for traffic in the opposite direction, from M1 to M25 anticlockwise
M1 Motorway
The M1 is a north–south motorway connecting London to Leeds, where it joins the A1(M) near Aberford. It was the first motorway to be completed in the United Kingdom.
The motorway is 193 miles long and was constructed in four phases. Most of the motorway was opened between 1959 and 1968 but the southern end was extended in 1977 and the northern end was extended in 1999.
M25, London Orbital Motorway
Officially named the London Orbital and frequently derided as nothing more than a very big car park, the M25 is a 117-mile orbital motorway that encircles London; one of the world's biggest ring roads (Europe's second longest orbital road after the Berliner Ring, which is 122 miles). It is not, however, a continuous loop of motorway as the Dartford Crossing section (comprising the Dartford Tunnels and the Queen Elizabeth II Bridge) over the Thames and its approach roads are designated as the A282.

Constructed between 1975 and 1986, the M25 is reputedly the most expensive motorway Britain ever built, costing a total of £909m or roughly £7.5m per mile, but at the time of its planning, the demand for the road was considerably underestimated so that when it was finally completed in 1986, it was already out of date. Demand outstripped capacity within a few years and ever since then it's been very heavily congested.

The M25 is one of the UK’s busiest motorways, carrying up to 200,000 vehicles and 10,000 HGVs per day (AADT - Annual Average Daily Traffic flow) on the section near to Heathrow Airport. Since its opening in the 1980s, the southern, western and eastern sections have been widened to largely dual four lane (D4M) standard, but much of the motorway retains its dual three lane road (D3M) cross-section as originally built.

The M25 was home to England's first Variable Speed Limits on motorways between the A3 and M4 in the early 1990s.

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TL1103, 50 images   (more nearby )
Photographer
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Date Taken
Tuesday, 30 May, 2017   (more nearby)
Submitted
Monday, 19 June, 2017
Geographical Context
Roads, Road transport 
Bridge (from Tags)
Motorway Over Motorway 
Primary Subject of Photo
Motorway Junction 
Subject Location
OSGB36: geotagged! TL 1163 0320 [10m precision]
WGS84: 51:42.9858N 0:23.1316W
Camera Location
OSGB36: geotagged! TL 1159 0319
View Direction
East-northeast (about 67 degrees)
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Motorway Bridges 

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