U.S. organization which helps develop standards which are often applied to the Manual on Uniform Traffic Control Devices. History, member information, and meeting information.

Photos of signs from the early 20th century.

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

Includes a graphics gallery of U.S. state route markers as displayed on guide signs, and personal marker cosmetic change proposals.

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

Website that accepts submissions of photographs of sign assemblies whose numbers can be arranged to form a mathematical operation.

Illustrations from 1961 from Scandinavia.

Images and descriptions of most Italian signs.

North Korean road signs.

Hundreds of funny road signs by category