Today I came across a book of driving shots by Daido Moriyama called "Route 16", very much along the same lines of what you're doing. You may be aware of this, but if not, it looked very interesting.
http://www.moriyamadaido.com/bibliography/pages/route16.htm - though the link doesn't provide much.
http://www.moriyamadaido.com/bibliography/pages/route16.htm - though the link doesn't provide much.