 It then continues north east through Whittlesey before terminating at a junction with the A141 between March, Cambridgeshire and Guyhirn.Basically, except for a short section at Oundle, its route follows the south bank of the River Nene.The road used to start at the A6 just north of Higham Ferrers and run to Thrapston and Peterborough, following the line of the Roman Road between Irchester and "Durobrivae" (Wansford).