A505 road

The A505 is an A-class road in England. It follows part of the route of the Icknield Way and the corresponding Icknield Way Path and runs from Leighton Buzzard, Bedfordshire to the A11, Cambridgeshire near Abington and Sawston. Being built in the East of England countryside, the majority of the road is flat, and some of the road is raised.

The first roundabout is the terminus point of the A1198, a Royston to Huntingdon road which is in a perfect straight line, and serves part of the London - Lincoln Roman Road, Ermine Street. This road was also previously numbered the A14. Ermine Street now joins the A1 and the A607 where it enters Lincoln. Unfortunately, the road is not all joined up, and there is very little trace south of Royston. The site of this Roundabout, or near Royston, may have been a junction for Ermine Street and Icknield Way. The previous dual carriageway may also be part of the ancient Icknield Way. If you were to continue along the A505 towards Cambridge, you would still be using the Icknield Way. The road may not just be Roman, with many fossils found along this path.
After the Junction with the A1198, is a large cutting to form the A505, then is a roundabout with the A10, with northbound going to Cambridge via the popular Shepreth Wildlife Park and Trumpington Park and Ride. Southbound on the A10 will take you into Royston towards London.
The A505 continues northbound, leaves Hertfordshire and enters Cambridgeshire.

Wikipedia