I have no fancy academic qualifications - just an interest in British Roman Roads.
I originally had this book on loan but decided I needed a copy for my own reference. It's well worth reading a couple of times and going back to.
A different slant on the subject, more from the construction point of view, which is very valuable and comes without pre-conceptions other books bring. I like the research method used, based on facts from past excavations. It is a fairly ruthless and un-romantic approach, helping to keep you on the right road (awful pun - apologies).
I personally would have like to have seen more aerial shots, photos, maps - as I need more illustration, but this is very accessible and easy to read, whilst getting through some highly technical stuff and dealing with a number of myths that have built up around this subject.
A must read if you share this particular interest and passion.