The Manual on Uniform Traffic Control Devices for Streets and Highways, affectionately known as MUTCD, is a federal publication that shows images of all the officially defined/approved signs and defines how all the markings and signs on roads should be implemented. As I understand it, localities don’t have to use any given sign, but they can’t use signs that aren’t in the MUTCD. (Correct me if I’m wrong.) Thw whole book is some 900 pages long; I’ve excerpted only Part 9, Traffic Control for Bicycle Facilities. It’s kind of interesting to browse through it — it’s like an old Sears Roebuck catalog for road signs.

• MUTCD 2009, Part 9 (PDF, 427 kb)