- Part of the Center for Economic and Environmental Development at Allegheny College in Pennsylvania. Page shows recent projects including two involving the sculpting of road signs into art ("Read Between the Signs" and "Signs and Flowers").
- 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.
- 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.
- Describes the unique attraction signage on freeways of this Canadian province. Official page of the provincial Department of Transportation and Public Works.