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Russian drivers are being left feeling more than a little wobbly after crossing a brand new bridge in Volgograd.
Alarming footage of the quivering 4.5 mile bridge has spread like wildfire on the internet, prompting President Dmitry Medvedev to demand a probe into what went wrong with the design of the project.
Reports say it bounces by more than three feet during strong winds, with a deafening screech accompanying the movement.
So far, experts blame the wrong kind of wind for the extreme turbulence suffered by drivers on the bridge - built by Moscow company Giprotransmost.
The pictures are from gale force winds last Thursday where wind speeds reached up to 18 metres per second.
Deputy Transportation Minister Oleg Belozyorov blamed the strength of the winds and dismissed a theory that an earthquake caused the bridge to wobble.
He said: 'Experts agree that it is the dynamics of the air.
'When winds gusts hit a certain resonance zone, they cause these kinds of consequences.'
Vladimir Parshin, an independent expert, said wind was the most likely cause despite this type of beam bridge - which took 13 years to build - being more stable than suspension bridges.
'The spans in the Volgograd bridge are rather long, so theoretically it could be less wind-resistant than other similar structures,' he told the Moscow Times.