Dozens of variations on the "Men at Work" theme.

Page by the Texas Transportation Institute illustrating the changes between each edition of the U.S. Manual on Uniform Traffic Control Devices. Also includes related articles.

Includes a list of all cities that use ramp metering systems.

Photos of an collection of signals and signs, many vintage, plus a gallery of photos covering many geographic areas.

Photos of signs from the early 20th century.

Chronicles the history and evolution of signs in the United Kingdom.

Large collection of French road signs.

Humorous examples.

Various graphic files of U.S. examples, some fictional.

A private citizen's proposals for new and altered signalization.