 The road passes under the East Coast Main Line and has a roundabout junction with the A15 immediately south of Peterborough city's Nene Bridge.The road turns south and overlaps the A15 for a short way before originally diverging to the left and passing under the Peterborough Southern Bypass (the A1139) at Stanground.Finally, there is junction with the A1139 access road and the A605 turns east towards Whittlesey on what was once an old toll road.