| Manual on Uniform Traffic Control Devices: The standard for signs, signals, and pavement markings in the United States. Includes HTML and .pdf versions. |
| Traffic Sign and Signals: International overview, emphasizing the Vienna Convention of 1968 standardizing traffic control. Thorough links section. |
| Arts and Environment Initiative: 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"). |
| Bartolomeo: Traffic Signs of the World: Examples of child crossing, construction, and falling rock signs worldwide. |
| Chinese Traffic Signs: Some images of Chinese signs, but the text is in Chinese. |
| Danny's Daily's The "Sign" Collection: Humorous examples. |
| Diamond Signs: Photograph collection of warning signs. |
| Evaluation of Traffic Signal Displays for Protected/Permitted Left-Turn Control: Research project studying controls for this movement, addressing such principles as the "left-turn trap". Includes animated graphic examples. |
| France Road Signs: Large collection of French road signs. |
| From War to Worboys: Chronicles the history and evolution of signs in the United Kingdom. |
| German Traffic Signs, Signals, and Markings: Illustrations and detailed commentary. |
| Hawaii Road Sign Photos: Many standard and unusual examples. |
| Highway Route Markers: Contains hundreds of images from around the world. |
| Interstate Highway Control Cities: Covers all 2-digit and major 3-digit U.S. Interstates and gives some explanation as to their selection. Transcription of an AASHTO document. |
| Italian & International Road Signs: Images of Italian signs with english descriptions. |
| Italian Road Signs: Most Italian road signs. |
| Japanese Traffic Signs: Three pages of Japanese signs with English descriptions. |
| Manual of Traffic Signs: A comprehensive listing of those most commonly used in the United States. |
| Men at Work: Dozens of variations on the "Men at Work" theme. |
| MiniTraff: Unofficial traffic signal simulator available for download. Uses Java. |
| Motorway Signs: Photos of approach, advance direction, exit, reassurance, and overhead signs on motorways in various countries. |
| MUTCD History: 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. |
| My Crazy Hobby: Photograph inventory of a large personal collection. |
| National Committee on Uniform Traffic Control Devices: U.S. organization which helps develop standards which are often applied to the Manual on Uniform Traffic Control Devices. Site includes history, member information, and meeting information. |
| New Zealand Road Signs: Images of common road signs. |
| Old California Traffic Signs: Photos of signs from the early 20th century. |
| Ramp Meters: Contains a list of all cities that use ramp metering systems. |
| Road Geek Stuff: Includes a graphics gallery of U.S. state route markers as displayed on guide signs, and personal marker cosmetic change proposals. |
| Road Sign Images: Various graphic files of U.S. examples, some fictional. |
| Road Sign Math: Website that accepts submissions of photographs of sign assemblies whose numbers can be arranged to form a mathematical operation. |
| Road Signs and History: Collection of news, webmaster's thoughts, and photographs. |
| Road Signs in Italy: Images and descriptions of most Italian signs. |
| Road Signs of DPRK: North Korean road signs. |
| Road Trip America Signs: Hundreds of funny road signs by category |
| Roadsigns and Signals: Basic European signage. |
| Shields Up!: Generates graphic route markers. |
| Sign Language: Many humorous road signs. |
| Sign Post Forest in Germany: Tourist attraction composed of donated road signs. Site includes visiting information. |
| Signalfan.com: Photos of an extensive collection of signals and signs, many vintage, plus a gallery of photos covering many geographic areas. |
| SignMaker: Java applet letting users create highway sign graphics. |
| Signs on Nova Scotia Roads and Highways: Describes the unique attraction signage on freeways of this Canadian province. Official page of the provincial Department of Transportation and Public Works. |
| Signspotters: Extensive photo collection of examples in Australia. |
| The Cone Epicentre: Includes information and photographss about traffic cones and other related subjects. |
| The Great International Highway Makeover: What highway signs could look like. |
| The Highway Code: Official document of the United Kingdom. Includes illustrations and usage of signs and signals. |
| The National Campaign to Stop Red Light Running: Advocacy group based in Washington, D.C., U.S. Site includes news, events, articles, and links. |
| The Open Road: Photos of and commentary on current and old signs and signals throughout the U.S. and Canada as well as welcome signs. |
| The Traffic Signal Museum: Illustrates a private collection of signals, including pedestrian. |
| The Traffic Signs Regulations and General Directions 2002: The standard for signs, signals, and pavement markings in the United Kingdom. Includes graphics. |
| This Flashing Green Arrow Plan (TFGAP): A private citizen's proposals for new and altered signalization. |
| Traffic Control Devices: Texas Transportation Institute page. Includes historical and research documents. |
| Traffic Signs in Lebanon: Images of most Lebanese signs. |
| Traffic Signs in Seoul Korea: A few good pictures of Korean signs and signals. |
| Traffic Signs, Markings and Signals: Illustrations of official traffic control devices in Taiwan. |
| Watson Lake Sign Post Forest: Gives the background on this feature in the Yukon Territory of Canada consisting of thousands of donated road signs. |
| Western New York Signals: Photograph collection. Also covers the Central and Capital/Adirondack regions of the state. |
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