This is a second version of an earlier cache which I archived when the extension to the busway east of Milton Road was being built. Now all has settled down, I found that the original hiding location is intact - indeed I managed to retrieve the old cache. The new hide is identical to the old one.
It is placed near the short tunnel on the cycle and footpath adjacent to the road. This was built when the railway was still in operation to provide a means of crossing the track even when the level crossing was down. (There are other similar examples on the lines north of Cambridge.) There is a lot of passing traffic at peak hours, so I would avoid looking for the cache then.
The cache is a nano, but should be easy to find. It is not accessible from road level. It is also not in or near any of the electrical wiring, and well clear of the ground: you will not have to rummage.
Please replace carefully to prevent it being muggled.