The closure has been in place from the Ashby Road junction in Thurton to the Chedgrave turn-off on the A146 since 7pm. Norfolk Police are advising drivers to adjust their routes. According to an eyewitness the accident involved a motorbike and happened shortly after an earlier crash on the same stretch of road was cleared. The X21 and X22 bus services are being diverted through Poringland and Ditchingham to reach the Loddon stops.