The purpose of the National Handbook of Traffic Control Practices for Low Volume Rural Roads (NLVR) is to assist local government units throughout the United States (US) in providing safe local roads for the traveling public. The MUTCD is a dynamic document that changes with time to address contemporary safety and operational issues. This effort ensures that TCDs are visible, recognizable, understandable, and necessary. The information contained in the MUTCD is the result of either years of practical experience, research, and/or the MUTCD experimentation process. Uniformity also helps reduce the cost of TCDs through standardization. The use of uniform TCDs (messages, location, size, shapes, and colors) helps reduce crashes and congestion, and improves the efficiency of the surface transportation system.
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The Manual on Uniform Traffic Control Devices (MUTCD), by setting minimum standards and providing guidance, ensures uniformity of traffic control devices across the nation. The traffic control devices (TCD) are very critical for the safe and efficient transportation of people and goods. Manual of Traffic Control Devises MUTCD 2009.United States Department of Transportation.Guidance For Improving Traffic and Roadway Safety Understanding Minimum Reflective Standards.Please contact your state Department of Transportation or local highway, public works, or traffic engineering department to find out which laws and regulations apply to signs and traffic control devices in your state or municipality. Each state has adopted either the Federal MUTCD "as is" or, the Federal MUTCD modified with a state supplement, or a state-specific traffic control manual which governs contains standards for traffic control devices that regulate, warn and guide road users along all roadways within that particular state. The MUTCD is a national standard, intended to ensure that traffic signs are consistent throughout the United States.