Road signs in the United States
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).

There are no plans for adopting the Vienna Convention on Road Signs and Signals standards. 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",[1][2][3] but U.S. drivers were baffled by symbol signs.[4][5] The language about "rapidly" transitioning to symbols was removed in the 1978 MUTCD.[6] The result was to effectively freeze several measures intended to be temporary until U.S. drivers could learn the relevant symbols' meanings. For example, the "Do Not Enter" word message is not found on the Vienna Convention's equivalent sign. Two symbol signs were eliminated, respectively, in the 2000 and 2003 MUTCDs (thereby requiring use of the previous word message signs): Pavement Ends and Narrow Bridge.[7]
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.[8] The MUTCD and SHS establish seven categories of signs for road and highway use, as follows:[9] (The list does not cover all situations; the signage is from the national MUTCD unless specified):
Regulatory signs
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.
R1 series: Stop and yield
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).
R1-1: Stop
PR R1-1 Stop (Puerto Rico)
R1-2: Yield
R1-2aP: To oncoming traffic (plaque)
R1-3P: All way (plaque)
R1-5: Yield here to pedestrians
R1-5a: Yield here to pedestrians
R1-5b: Stop here for pedestrians
R1-5c: Stop here for pedestrians
R1-6: In-street pedestrian crossing[lower-alpha 1]
R1-6a: In-street pedestrian crossing[lower-alpha 1]
R1-6b: In-street school crossing
R1-6c: In-street school crossing
R1-7: Wait on stop
R1-8: Go on slow
R1-9: Overhead pedestrian crossing[lower-alpha 1]
R1-9a: Overhead pedestrian crossing[lower-alpha 1]
R1-10P: Except right turn (plaque)
R2 series: Speed limit
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 are authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system.[10] Many states, however, disallow the use of metric signs on state-maintained roads due to MUTCD restrictions,[11] increasing the rarity of such signs.
R2-1: Speed limit
R2-1: Speed limit (metric)
R2-2P: Truck speed limit (plaque)
R2-2P: Truck speed limit (metric)
R2-3P: Night speed limit (plaque)
R2-3P: Night speed limit (metric)
R2-4P: Minimum speed limit (plaque)
R2-4P: Minimum speed limit (metric)
R2-4a: Combined speed limit
R2-5P: Unless otherwise posted (plaque)
R2-6bP: $XX fine (plaque)
R2-10: Begin higher/double fines
R2-11: End double/higher fines
R3 series: Lane usage and turns
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.
R3-1: Movement prohibition, no right turn
R3-2: Movement prohibition, no left turn
R3-3: Movement prohibition, no turns
R3-4: Movement prohibition, no U-turn
R3-5L: Mandatory movement lane control, left turn only
R3-5R: Mandatory movement lane control, right turn only
R3-5a: Mandatory movement lane control, through only
R3-5bP: Left lane (plaque)
R3-5eP: Center lane (plaque)
R3-5fP: Right lane (plaque)
R3-5gP: Bus lane (plaque)
R3-6L: Optional movement lane control, through and turn
R3-6R: Optional movement lane control, through and turn
R3-7L: Left lane must turn left
R3-7R: Right lane must turn right
R3-8: Advance intersection lane control (two lanes)
R3-8a: Advance intersection lane control (three lanes)
R3-8b: Advance intersection lane control (three lanes)
R3-9a: Two-way left turn only (overhead)
R3-9b: Two-way left turn only (post-mounted)
R3-9e: Reversible lane control (overhead)
R3-9f: Reversible lane control (post-mounted)
R3-9g: Advance reversible lane control transition
R3-9h: Advance reversible lane control transition
R3-9i: End reverse lane
R3-10: Preferential lane vehicle occupancy definition (post-mounted)
R3-10a: Preferential lane vehicle occupancy definition (post-mounted)
R3-11: Preferential lane operation, high-occupancy vehicles (post-mounted)
R3-11a: Preferential lane operation, high-occupancy vehicles (post-mounted)
R3-11d: Preferential lane operation (post-mounted)
R3-11b: Preferential lane operation, high-occupancy vehicles, full-time (post-mounted)
R3-12: Preferential lane ahead, high-occupancy vehicles (post-mounted)
R3-12a: Preferential lane ends, high-occupancy vehicles (post-mounted)
R3-12b: Preferential lane ends, high-occupancy vehicles (post-mounted)
R3-13: Preferential lane vehicle occupancy definition (overhead)
R3-13a: Preferential lane vehicle occupancy definition (overhead)
R3-14: HOV lane operation (overhead)
R3-14a: HOV lane operation (overhead)
R3-14b: HOV lane operation (overhead)
R3-15: HOV lane ahead (overhead)
R3-15a: HOV lane begins XX miles (overhead)
R3-17: Bike lane
R3-18: Movement prohibition, no U or left turn
R3-27: Movement prohibition, no straight through
No left turn across tracks
R4 series: Regulation of movement
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.
Do not pass
Pass with care
Slower traffic keep right
Begin right turn lane yield to bikes
Trucks use right lane
Truck lane 500 feet
Keep right
Keep right
Keep right
Keep right of obstacle
Keep left
Keep left
Keep left
Keep left of obstacle
Stay in lane
Runaway vehicles only
Cyclists may use full lane
Slow vehicles with five or more following vehicles must use turn-out
Slow vehicles must use turn-out ahead
Slow vehicles must turn out
Keep right except to pass
Do not drive on shoulder
Do not pass on shoulder
R5 series: Exclusionary
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.
Do not enter
Wrong way
Wrong way for bicycles
No trucks
No motorized vehicles
No commercial vehicles
No lugged vehicles
No bicycles
No non-motorized traffic
No motor driven cycles
No pedestrians, bicycles or motor driven cycles
No pedestrians or bicycles
No pedestrians
No unauthorized vehicles
R6 series: One way and divided highway
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.

One way, alternate
Divided highway crossing
Divided highway crossing, T-intersection
Chevron roundabout directional
Chevron roundabout (three chevrons)
Chevron roundabout (four chevrons)
R7 series: Parking
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.[12] 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.[12] As with no parking signs, some restrictions displayed on the signs are permanent, and some are time-based.
No parking any time
No parking from 8:30 am to 5:30 pm
No parking from 8:30 am to 5:30 pm (alternative)
No parking except Sundays and Holidays
No standing any time
one hour parking time
Two hour parking time
No parking, loading zone
Parking fee station
Reserved parking (wheelchair)
Van accessible
No parking, bus stop
Parking pay parking
No parking and one hour parking time (combined)
Tow away zone
R8 series: Parking and emergency restrictions
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.
No parking on pavement
No parking
Exception of Sundays and holidays
On tracks plaque
Except on shoulder plaque
Loading zone
No stopping on pavement
Stop here when flashing
R9 series: Bicycles and pedestrians
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.
Walk on left facing traffic
Cross only at cross walks
No pedestrians
No rollerblading
No hitch hiking
Bicycles left pedestrians right
Sidewalk Closed Use Other Side
No horseback riding
R10 series: Traffic signal
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.
Crosswalk signal instructions
Stop here on red
Turning vehicles yield to pedestrians
Left turn signal
Left turn yield on green
Bicycles to request green wait on line
Left turn yield on flashing yellow arrow, version 1
Left turn yield on flashing arrow, version 2
R11 series: Road closed
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.
Road closed
Road closed XX miles ahead
Bridge out XX miles ahead
R12 series: Weight limits
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.
Weight limit
Axle weight limit
Truck weight limit
Weight limit with per axle and gross
Weight limit with truck symbols
R13 series: Weigh stations
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.
Weigh station sign
Weigh station next right sign
Weigh station sign with right exit arrow
R14 series: Truck routes
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.
Truck route sign
Hazardous material route
Hazardous material prohibited
National Network Route
National Network prohibited
R15 series: Rail and light rail
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.
Railroad crossing (crossbuck)
Three tracks
This railroad stop is exempt from the horn blowing
Light rail only in right lane
Light rail only in left lane
Light rail only in center lane
Do not pass stopped trains
Do not drive on tracks
Divided highway transit rail crossing
Look both ways at track
R16 series: Seat belts and headlight use
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.
Wear seat belt
Lights on when raining
Check headlights
Turn on headlights
Fender bender
Warning signs
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.
W1 series: Horizontal alignment
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.
Turn
Curve
Curve with minor road
Reverse turn
Reverse curve
Arrow
Double arrow
Chevron
Winding road
Turn around road
Truck rollover warning
270-degree loop
W2 series: Junctions
The MUTCD's W2 series of signs is for warning signs relating to junctions. As not all situations are covered, several states have their own standards in addition to the MUTCD.
Crossroad junction
Side road junction
Side road junction
Slanted side road junction
T junction
Y junction
Offset side roads
Double side roads
W3 series: Advance traffic control
The MUTCD's W3 series of signs is for warning signs relating to advance traffic controls. As all situations are not covered, several states have their own standards in addition to the MUTCD. The MUTCD provides options for graphic and text signs.
Stop sign ahead
Yield sign ahead
Speed limit ahead
Traffic lights ahead
Be prepared to stop
Speed zone ahead
Draw bridge ahead
Ramp meter ahead
Ramp metered when flashing
W4 series: Lanes and merges
The MUTCD's W4 series of signs is for warning signs relating to lane merges and added lanes, as well as lane endings. As all situations are not covered, several states have their own standards in addition to the MUTCD.
Merge ahead
Right lane ends
Lane drop ahead
Added left lane
Added right lane
Cross traffic does not stop
Merge on slip lane
Added left lane on slip lane
Added right lane on slip lane
W5 series: Road width restrictions
The MUTCD's W5 series of signs is for warning signs relating to road width restrictions. As all situations are not covered, several states have their own standards in addition to the MUTCD. The MUTCD provides options for graphic and text signs.
Road narrows
Narrow bridge
One lane bridge
Path narrows
Bikeway narrows
W6 series: Divided highway
The MUTCD's W6 series of signs is for warning signs relating to divided highways. As all situations are not covered, several states have their own standards in addition to the MUTCD. The MUTCD provides options for graphic and text signs.
Divided highway starts
Divided highway ends
Two-way traffic
W7 series: Hills
The MUTCD's W7 series of signs is for warning signs relating to hills. As all situations are not covered, several states have their own standards in addition to the MUTCD.
Steep grade/hill
Steep grade/hill percentage
Use low gear
Trucks use lower gear
X% grade ahead
Next XX miles ahead
X% grade XX miles ahead
Runaway truck ramp ahead
Runaway truck ramp (right)
Runaway truck ramp (left)
Runaway truck ramp this lane
Truck escape ramp
Sand
Gravel
Paved
Hill (bike)
Hill blocks view
W8 series: Pavement and roadway conditions
The MUTCD's W8 series of signs is for warning signs relating to pavement and roadway conditions. As all situations are not covered, several states have their own standards in addition to the MUTCD.
Bump
Dip
Pavement ends
Soft shoulder
Slippery ahead
Loose gravel
Rough road
Bicycle slippery ahead
Uneven lanes
No center line
Bridge ices before road
Fallen rocks
Metal bridge deck
Road may flood
Gusty Winds Area
Fog area
No shoulder ahead
Shoulder ends
W9 series: Lane transitions
The MUTCD's W9 series of signs is for warning signs relating to lane transitions. As all situations are not covered, several states have their own standards in addition to the MUTCD.
Lane ends
Lane ends merge
Center lane closed ahead
W10 series: Crossings
The MUTCD's W10 series of signs is for warning signs relating to crossings. As all situations are not covered, several states have their own standards in addition to the MUTCD.
Railroad crossing ahead
Exempt (plaque)
Junction ahead with parallel tracks (right)
Junction ahead with parallel tracks (left)
Side road junction track crossing (right)
Side road junction track crossing (left)
T-Junction with parallel tracks (right)
T-Junction with parallel tracks (left)
Low ground clearance
Low ground clearance plate
Light rail activated sign
Trains may exceed XX mph
No train horn warning
No train horn plate
Storage space symbol
XX feet between tracks and highway
XX feet between highway and tracks behind you
Skewed crossing ahead
Skewed crossing ahead
No gates or lights (plaque)
Next crossing (plaque)
Use next crossing (plaque)
Rough crossing (plaque)
W11 series: Advance warnings
The MUTCD's W11 series of signs is for warning signs relating to advance warnings. As all situations are not covered, several states have their own standards in addition to the MUTCD. The MUTCD allows use of a fluorescent yellow-green background color for signs relating to non-motorized vehicles crossing the road.[13]



Cattle
Farm vehicles
Snowmobile
Equestrian
Emergency vehicle
Handicapped

Horse-drawn vehicles
Bicycle and pedestrians

Ram



W12 series: Obstacles
The MUTCD's W12 series of signs is for warning signs relating to obstacles. As all situations are not covered, several states have their own standards in addition to the MUTCD. Metric low bridge signs in meters are authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system.[10] Many states, however, disallow the use of metric signs on state-maintained roads due to system restrictions, increasing the rarity of such signs.
W13 series: Advisory speeds
The MUTCD's W13 series of signs is for warning signs relating to advisory speeds. 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 advisory speed signs in kilometers per hour are authorized but extremely rare, usually seen near the borders with Canada and Mexico, both of which use the metric system.[10] Many states, however, disallow the use of metric signs on state-maintained roads due to system restrictions, increasing the rarity of such signs.
Speed advisory
Speed advisory metric
Exit speed advisory
Ramp speed advisory
W14 series: Dead end streets and no passing zones
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.
No outlet
No outlet on the left
No outlet on the right
Dead end
Dead end on the left
Dead end on the right
Road ends (Texas)
No passing zone
W15 series: Playgrounds
The MUTCD's W15 series of signs is for warning signs relating to playgrounds. As all situations are not covered, several states have their own standards in addition to the MUTCD.
W16 series: Supplemental plaques
The MUTCD's W16 series of signs is for supplemental plaques for warning signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.
XX feet
XX feet
X miles
X miles
Next XX feet
Advance street name
Advance street name (double arrow)
Ahead
Photo enforced
HOV
Roundabout junction plaque
When flashing
New
Notice
W17 series: Speed humps
The MUTCD's W17 series of signs is for warnings relating to speed humps. As all situations are not covered, several states have their own standards in addition to the MUTCD.
Speed hump
W18 series: No traffic signs
The MUTCD's W18 series of signs is for warnings relating to no further traffic signs. As all situations are not covered, several states have their own standards in addition to the MUTCD.
No traffic signs
W19 series: Freeway or expressway end signs
The MUTCD's W19 series of signs is for warning signs relating to the end of a freeway or expressway. As all situations are not covered, several states have their own standards in addition to the MUTCD.
Freeway ends XX mile
Expressway ends XX mile
Freeway ends
Expressway ends
All traffic must exit
W20 series: Work zones
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 all situations are not covered, several states have their own standards in addition to the MUTCD.
Road work next XX miles
End road work
Work zone plaque (usually under an R2 speed limit sign)
Road work XXXX feet ahead
Road closed ahead
Road is closed XXXX feet ahead
Detour
End eetour
End (if a road work blocked road)
Flagger ahead
W21 series: Road work
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
One lane road XXXX feet ahead
Be prepared to stop
Men working
Fresh oil
Utility work ahead
W22 series: Blasting zones
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 all situations are not covered, several states have their own standards in addition to the MUTCD.
Blasting zone ahead
Turn off 2-way radios and cell phones
End blasting zone
W23 series: Slow traffic
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 all situations are not covered, several states have their own standards in addition to the MUTCD.
Slow traffic ahead
New traffic pattern ahead
W24 series: Lane shifts
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 all situations are not covered, several states have their own standards in addition to the MUTCD.
Single reverse curve
Double reverse curve
Triple reverse curve
All lanes
W25 series: Oncoming traffic has extended green
The MUTCD's W25 series of signs is for signs warning that oncoming traffic has an extended green signal at a traffic light. As all situations are not covered, several states have their own standards in addition to the MUTCD.
Extended green
Possible extended green
Guide signs
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[14] (and should indicate center lane exit).
Interchange signs
Interchange guide sign
Interchange guide sign
Interchange exit direction
Exit number sign
Exit sign
Exit number sign with speed advisory
Mileage signs for highway routes
Specific service signs for food (as shown)
Interstate oasis
Advanced services sign
Toll signs
Chapter 2F of the MUTCD deals with signs relating to tolls.
Toll road pass only
Toll road pass or high-occupancy vehicle (HOV)
Toll costs on express lane
Toll costs on express lane or HOV
MUTCD conventional toll plaza advance sign
MUTCD conventional toll plaza advance sign
Pay toll
Electronic toll collection pass only
Toll late speed limit (Spanish)
Take ticket
Toll pricing
Motorist services



Trailer camping
Litter container
Handicapped accessible

Lodging
General information
Alternative fuel (CNG)
Electric vehicle charging
Alternative fuel (E85)
RV sanitary station
Ambulance symbol
Propane gas
Truck parking
Telecommunication (TDD/TYY)
Wireless internet
School zone signs
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. As of 2009 the MUTCD requires school warning signs to have fluorescent yellow-green backgrounds.[15]
School zone ahead (also used for pedestrian crosswalks near schools) since 1998
School (old)
School bus stop ahead
School bus turn ahead
Time of Day
When children are present
School plaque
When lights flashing
School speed limit ahead
School Speed zone ahead
Day(s) of the week
All year school zone ahead
School speed limit when flashing
End school zone (usually under an R2 speed limit sign)
See also
Notes
- The legend STATE LAW is optional. A fluorescent yellow-green color may be used instead of yellow for this sign.
- A fluorescent yellow-green background color may be used for this sign.[13]
References
- American Association of State Highway Officials; National Joint Committee on Traffic Control Devices (1971). "Section 2A-13, Symbols". Manual on Uniform Traffic Control Devices for Streets and Highways. Washington, D.C.: U.S. Department of Transportation, Federal Highway Administration. p. 16. Retrieved July 21, 2020.
- "Symbols to Replace Words on U.S. Traffic Signs". The New York Times. May 31, 1970. p. 58.
- Lindsey, Robert (April 23, 1972). "Signs of Progress: Road Symbols Guiding Traffic". The New York Times. p. S22. Retrieved August 19, 2020.
- Hazlett, Bill (March 23, 1972). "Some Confusing: Wordless Traffic Signs Popping Up". Los Angeles Times. p. E1. Available through ProQuest Historical Newspapers.
- Conniff, James C.G. (March 30, 1975). "Danger: Signs ahead". The New York Times. p. 183. Retrieved August 19, 2020.
- American Association of State Highway Officials; National Joint Committee on Traffic Control Devices (1978). "Section 2A-13, Symbols". Manual on Uniform Traffic Control Devices for Streets and Highways. Washington, D.C.: U.S. Department of Transportation, Federal Highway Administration. p. 2A-6.
- American Association of State Highway and Transportation Officials; National Joint Committee on Traffic Control Devices (2003). "Introduction". Manual on Uniform Traffic Control Devices for Streets and Highways. Washington, D.C.: U.S. Department of Transportation, Federal Highway Administration. Retrieved August 26, 2020.
- "MUTCDs & Traffic Control Devices Information by State". Manual on Uniform Traffic Control Devices. Federal Highway Administration. July 14, 2020. Retrieved January 11, 2021.
- Staff. "The Shape—and Color—Give Us a Sign". Federal Highway Administration. Archived from the original on April 1, 2009. Retrieved April 5, 2009.
- "Metric signs in the US". US Metric Association. Retrieved August 8, 2023.
- "23 CFR Part 655 National Standards for Traffic Control Devices; the Manual on Uniform Traffic Control Devices for Streets and Highways; Revision; Final Rule" (PDF). Retrieved April 2, 2019.
- Staff (October 2011). "Chapter 7: Parallel Parking". Driver's Manual and Study Guide. New York State Department of Motor Vehicles. Retrieved March 16, 2012.
- "2009 Edition Part 2 Figure 2C-11. Non-Vehicular Warning Signs". Manual on Uniform Traffic Control Devices. United States Department of Transportation. Retrieved June 6, 2012.
- "MUTCD, Section 2E.28 - Interchange Exit Numbering" (PDF).
- "2009 Edition Chapter 7B. School Signs". Manual on Uniform Traffic Control Devices. The United States Department of Transportation. Retrieved June 6, 2012.
External links
Media related to Road signs in the United States at Wikimedia Commons














