PICTURES AND VIDEO: Busy Sheffield road cordoned off following serious crashÂ
There is a huge police cordon in place atÂ St Mary's Gate between the roundabouts of London Road and Ecclesall Road, which has been closed to traffic for several hours.
A police forensic collision investigation vehicle was conducting speed and braking tests up and down the road.Â
Witnesses claimed there has been a serious crash overnight.Â
South YorkshireÂ Police are due to release further details this morning.Â