The cable-stayed section is supported by four 84 metre (276 feet) pylons atop concrete piers, each 53 metres (174 feet) in height.
The bridge spans, approach viaducts and pylons incorporate 19,000t of structural steel.
The bridge, which is a 24-hour, seven-day-per-week toll bridge, carries over 50 million vehicles per annum.
Devices are buried in the road deck and fixed atop the bridge which measure air temperature and wind speed; if safe parameters are exceeded, the bridge can be closed with southbound traffic diverted through one of the road tunnels.
The Queen Elizabeth II Bridge is roughly 32 kilometres (20 miles) east of London and conveys the M25 (the world's longest orbital motorway) over the River Thames between Dartford in the county of Kent and Thurrock in the county of Essex.
The bridge supports a four-lane carriageway carrying traffic south whilst two 1.4 kilometre (0.8 mile) tunnels cater for the northbound traffic.
The bridge comprises a cable-stayed section of 812 metres (2,664 feet) with a main span of 450 metres (1,476 feet) and two approach viaducts being 1,008 metres (3,307 feet) on the Kent side and 1,052 metres (3,451 feet) on the Essex side.
The bridge's pylons sport aircraft warning beacons, and radar reflectors and navigation lights to pinpoint the shipping channel.
The bridge was opened by Queen Elizabeth II in October 1991.
On completion, The Queen Elizabeth II Bridge was one of the world's longest cable-stayed bridges.
The bridge has garnered the following accolades: Winner of the Institution of Civil Engineers Special Award, the British Construction Industry Award and the Concrete Society Award.
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