What Did the Romans Ever do for Us? III Mystery Cache

Something for you to think about:

Camulodunum Stane Street + Akeman Street - Ermin Way

Devil's Causeway + Peddar's Way + Stone Street

(Ackling Dyke + Akeman Street)/Cade's Road

({Icknield Street + Military Way} x 4) + Cade's Road

This is the third of my 'What Did the Romans Ever do for Us?' caches. Hopefully this shouldn't be too hard with a bit of lateral thinking - the puzzle part is easier than number 2, and finding the cache itself should not be too hard. Cache is a small micro which can be done as a cache and dash.

Puzzle rating = 2.5, cache difficulty rating = 1.5

There may be a slight degree of error depending on where you get your answers from so I have set the Certitude checker to accept this.

You can validate your puzzle solution with certitude.