The MUTCD's W4 series of signs is for warning signs relating to lane merges and added lanes, as well as lane endings. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W20 series of signs is for warning signs relating to work zones. These signs are typically orange background ones used for temporary situations. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W12 series of signs is for warning signs relating to low clearance. Metric low bridge signs in meters used to be authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system.[5] They have been discontinued as of 2012. Many states, however, disallowed the use of metric signs on state-maintained roads due to system restrictions, increasing the rarity of such signs. As not all situations are covered, several states have their own standards in addition to the MUTCD.

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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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The MUTCD's W22 series of signs is for warning signs relating to blasting zones. They typically have orange backgrounds and are used for temporary situations. As not all situations are covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's W16 series of signs is for supplemental plaques for warning signs. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W8 series of signs is for warning signs relating to pavement and roadway conditions. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD allows for three types of parking signs: permissive, No Parking, and No Standing. However, in most states, there is an additional more restrictive one, No Stopping. These signs are found in the R7 series of signs in the MUTCD. As all situations are not covered, several states and local governments have their own standards in addition to the MUTCD. Permissive parking signs allow for parking for either an unlimited or varied amount of time. They are often used in conjunction with parking meters and parking permits. They are specified by the MUTCD to be green on white. Local variations occur with additional information and slightly different designs. No Parking signs indicate that loading or unloading while temporarily stopped is permitted, but the driver must not leave the vicinity of the vehicle.[7] Some No Parking signs display time restrictions, while others are permanent restrictions. There are also temporary versions of the signs, often of similar design to the permanent ones. These signs are specified by the MUTCD to be red on white, although local variations occur. No Standing signs indicate that stopping temporarily to load or unload passengers is allowed, but vehicles cannot be stopped at the location for longer periods of time, even if the driver remains with the vehicle.[7] As with no parking signs, some restrictions displayed on the signs are permanent, and some are time-based.

The MUTCD's R12 series of signs is for weight limit-related signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

Regulatory signs give instructions to motorists, pedestrians, and cyclists. 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. Some have special shapes, such as the octagon for the Stop sign and the crossbuck for railroad crossings. Some signs can be localized, such as No Parking, and some are found only in state and local jurisdictions, as they are based on state or local laws, such as New York City's "Don't Block the Box" signs. These signs are in the R series of signs in the MUTCD and typically in the R series in most state supplements or state MUTCDs.

Eighteen 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.[3] The MUTCD and SHS establish seven categories of signs for road and highway use, as follows:[4] (The list does not cover all situations; the signage is from the national MUTCD unless specified):

The 11th edition of the MUTCD was released on December 19, 2023.[1] The effective date, 30 days after publication, of the MUTCD was January 18, 2024. States have two years after the effective date to do one of the following options: adopt the revised MUTCD, adopt the revised MUTCD with a state supplement, or adopt a state-specific MUTCD.[2]

The MUTCD's R10 series of signs is for traffic signal related signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's W9 series of signs is for warning signs relating to lane transitions. As not all situations are covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's R4 series of signs is for the regulation of movement signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

Guide signs include highway route markers (shields), which are reassurance markers, interchange signs, including advance guide and exit signs, and mile markers. Advance guide and exit signs usually feature control cities or other locations to help direct drivers toward their destinations. The position of the exit number plaque indicates right or left exit[9] (and should indicate center lane exit).

The MUTCD's R8 series of signs is for parking restriction and emergency restriction signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W14 series of signs is for warning signs relating to dead-end streets and no-passing zones. As all situations are not covered, several states and local governments have additional signs for other types of situations not covered by the MUTCD. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W10 series of signs is for warning signs relating to railroad crossings. As not all situations are covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's R11 series of signs is for road closure-related signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W3 series of signs is for warning signs relating to advance traffic controls. The MUTCD provides options for graphic and text signs. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's R2 series is for speed limit signs. Some state supplements and state MUTCDs place various speed limit signs in other series. As all situations are not covered, several states have their own standards in addition to the MUTCD. Speed limits in the United States are always in miles per hour. Metric speed limit signs in kilometers per hour used to be authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system.[5] They have been discontinued as of 2012. Many states, however, disallow the use of metric signs on state-maintained roads due to MUTCD restrictions,[6] increasing the rarity of such signs.

The MUTCD's W13 series of signs is for warning signs relating to advisory speeds. Speed limits in the United States are always in miles per hour. Metric advisory speed signs in kilometers per hour used to be authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system.[5] They have been discontinued as of 2012. Many states, however, disallowed the use of metric signs on state-maintained roads due to system restrictions, increasing the rarity of such signs. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's R14 series of signs is for truck route-related signs. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W21 series of signs is for warning signs relating to road work. They typically have orange backgrounds and are used for temporary situations. As all situations are not covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's W17 series of signs is for warnings relating to speed humps. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's R6 series of signs is for one way and divided highway signs. As all situations are not covered, several states have their own standards in addition to the MUTCD. The most common of these signs is the One Way sign.

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The MUTCD's R16 series of signs is for seat belt and headlight use-related signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's W6 series of signs is for warning signs relating to divided highways. The MUTCD provides options for graphic and text signs. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W1 series of signs is for warning signs relating to horizontal alignment. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's R9 series of signs is for bicycle and pedestrian signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's W25 series of signs is for signs warning that oncoming traffic has an extended green signal at a traffic light. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's R15 series of signs is for rail- and light rail-related signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's W15 series of signs is for warning signs relating to playgrounds. As not all situations are covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's W18 series of signs is for warnings relating to no further traffic signs. As not all situations are covered, several states have their own standards in addition to the MUTCD.

Warning signs are found in the W series of the national MUTCD. They highlight existing conditions, such as a curve, school, dead end street, or traffic signal. They can also warn of possible danger such as bumps, bicycles, low flying aircraft, or emergency vehicles. They are either yellow or fluorescent yellow in color and, with a few exceptions, are usually diamond-shaped and sometimes have square or rectangular smaller signs or plaques associated with them. Most W series signs can also be found with orange backgrounds for temporary use in situations such as construction zones. Some of the temporary-use signs are for use only in temporary situations.

The MUTCD's W5 series of signs is for warning signs relating to road width restrictions. The MUTCD provides options for graphic and text signs. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W11 series of signs is for warning signs relating to advance warnings. The MUTCD allows use of a fluorescent yellow-green background color for signs relating to non-motorized vehicles crossing the road.[8] As not all situations are covered, several states have their own standards in addition to the MUTCD.

The S series of signs are specially designated by the MUTCD for use around schools. Some states have additional school warning-related signs in the S series, the W series of warning signs, and/or the R series of regulatory signs of the state supplement or state MUTCD. The adoption of the 2009 MUTCD required school warning signs to have fluorescent yellow-green backgrounds.[10]

The MUTCD's R13 series of signs is for weigh station related signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's W23 series of signs is for warning signs relating to slow traffic. They typically have orange backgrounds and are used for temporary situations. As not all situations are covered, several states have their own standards in addition to the MUTCD.

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The MUTCD's R1 series is for Stop and Yield. As not all situations are covered, several states have their own standards in addition to the MUTCD. The 4-WAY and 3-WAY plaques (R1-3) were deprecated in the 2009 Edition of the MUTCD in favor of the ALL WAY plaque (R1-3P).

The MUTCD's R5 series of signs is for exclusionary signs. As all situations are not covered, several states have their own standards in addition to the MUTCD. The most common of these signs is the do not enter sign.

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The MUTCD's R3 series of signs is for lane usage and turn signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W2 series of signs is for warning signs relating to intersections. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W7 series of signs is for warning signs relating to hills. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W24 series of signs is for warning signs relating to lane shifts, where traffic is diverted slightly toward the left or right of the roadway, but the route is otherwise unchanged. These signs typically have orange background and are used for temporary situations. As not all situations are covered, several states have their own standards in addition to the MUTCD.

The MUTCD's W19 series of signs is for warning signs relating to the end of a freeway or expressway. As not all situations are covered, several states have their own standards in addition to the MUTCD.