![]() Some have special shapes, such as the octagon for the Stop sign and the crossbuck for railroad crossings. Signs including Stop, Yield, No Turns, No Trucks, No Parking, No Stopping, Minimum Speed, Right Turn Only, Do Not Enter, Weight Limit, and Speed Limit are considered regulatory signs. Regulatory signs give instructions to motorists, pedestrians, and cyclists. The MUTCD and SHS establish seven categories of signs for road and highway use, as follows: (Please note the list does not cover all situations, and the signage is from the national MUTCD unless specified): Įighteen states use the manual without alterations 22 states, the District of Columbia, and Puerto Rico have adopted it in conjunction with a supplemental volume and ten states have a state version in substantial conformance to the MUTCD. Two symbol signs were eliminated, respectively, in the 20 MUTCDs (thereby requiring use of the previous word message signs): Pavement Ends and Narrow Bridge. ![]() For example, the "Do Not Enter" word message is not found on the Vienna Convention's equivalent sign. drivers could learn the relevant symbols' meanings. The result was to effectively freeze several measures intended to be temporary until U.S. The language about "rapidly" transitioning to symbols was removed in the 1978 MUTCD. The 1971 MUTCD adopted several Vienna Convention-inspired symbol signs with the intent to transition to symbols in lieu of words as "rapidly as possible", but U.S. There are no plans for adopting the Vienna Convention on Road Signs and Signals standards. ![]() In the United States, road signs are, for the most part, standardized by federal regulations, most notably in the Manual on Uniform Traffic Control Devices (MUTCD) and its companion volume the Standard Highway Signs (SHS). ![]()
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