east of the girton interchange with the m11 at cambridge, the a14 used to be the a45, and much of the long-distance traffic further west had previously used the a45 route. the section between cambridge and kettering used to be the a604, apart from a short section near kettering that used to be part of the a6. the road which was the a14 until the late 1980s is now the a1198 between royston, hertfordshire and godmanchester. north of godmanchester the route of the original a14 became part of the a604, itself now part of the new a14 until it meets the a1 road near alconbury, thus forming a 'spur' off the a14.