A second manhole cover has collapsed on the A47 in two days.
BT is warning of delays after putting up traffic lights near Little Fransham.
Earlier today engineers had been on the A47 repairing a manhole cover at Necton.
A BT spokesman said: “We have been made aware of a manhole collapse which needs urgent repair. This is currently being worked on under two-way lights on the Westbound carriageway of the A47 between the A1075 and A1065 near Little Fransham and will be in place overnight.
“We would like to apologise for any inconvenience whilst this work was being carried out