Handbook of highway construction

I've been playing with Google Maps lately when I have a couple of minutes to kill, usually travelling through the American heartland looking for freeway cloverleafs, and other pinnacles of highway design. On reflectio I think there's two reasons I like doing this - Douglas Coupland's Gen X or Microserfs made reference to a book on highway design, and I have this nice small artwork by Danny Landall that is done on a page ripped out of an old highway construction manual.

Here's my favourite freeway find so far - from just outside Phoenix Ar, and if I can find it, the work by Danny.