Delays remain on the A11 near Babraham as work continues to establish the source of a sinkhole that has opened in the road. National Highways is advising motorists to allow extra time as lane two is closed on both the north and southbound carriageways – and these closures are expected to remain over the coming days. Motorists are also warned that a full closure of the southbound carriageway may be necessary this afternoon (Thursday). However, National Highways officers are trying to avoid this by cutting vegetation back to provide alternative access for engineers. The sinkhole was first discov…