The top line is a direction marker and not part of the phrase below - it's not clear from the photo but there is a < to the left of Aquae Arnemetiae and a > to the right of Derventio. The former is the Roman name for Buxton and the latter, I'm guessing, refers to Derventio Coritanorum, a Roman town that was situated near modern-day Derby.
Huius viae curam curatores viarum non susceperunt translates (I think - I'm very rusty!!) as The guardians of roads did not undertake the care of this road.