From the A14 Spur's junction with the B1043 to the A1(M).

Came into life when the A1 was upgraded between Alconbury and Peterborough.

Motorway legislation states that any road leading inescapably to a motorway must also be signed as motorway.

Legally this road is numbered A604(M), however for administrative purposes the Highways Agency have it shown as A14(M).

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