MUTCD/W

Series W of the MUTCD is for warning signs.

Temporary warning signs

This series includes warning signs for temporary traffic control zones, i.e., construction zones, as well as for incident management areas. Whereas a regulatory sign appears the same inside and outside a construction zone, a temporary warning sign has an orange background instead of the usual yellow, and an incident management warning sign has a fluorescent pink background. California and Texas place construction warning signs in separate series C and CW, respectively. Incident management area signs are not to be confused with the emergency management signs of Series EM.

• W3-4
• 

  Normal

• 

  Construction zone

• 

  Incident management area

In general, OpenStreetMap only maps long-term closures and construction sites. For routing purposes, short-term construction is more reliably and efficiently tracked in incident management systems along with real-time traffic congestion data. However, if a temporary warning sign happens to be posted on a long-term basis for some reason, you can map it as you would map a permanent warning sign. If you map the temporary traffic sign as a node, use a W code but add colour=orange or pink to the node.

W1: Curves and Turns‎

Sign or plaque	Designation	Name	Tags	Notes
	W1-1L	Turn	hazard=turn
	W1-1R
	W1-2L	Curve	hazard=curve
	W1-2R
	W1-3L	Reverse Turn	hazard=turns
	W1-3R
	W1-4L	Reverse Curve	hazard=curves curves=serpentine
	W1-4R
	W1-4bL	Reverse Curve (2 lanes)	hazard=curves curves=serpentine change=no	Speculative
	W1-4bR
	W1-4cL	Reverse Curve (3 or more lanes)	hazard=curves curves=serpentine change=no	Speculative
	W1-4cR
	W1-5L	Winding Road	hazard=curves curves=extended
	W1-5R
	W1-6L	One-Direction Large Arrow	hazard=turn
	W1-6R
	W1-7	Two-Direction Large Arrow	hazard=dangerous_junction	$1% More details at taginfo More details at taginfo
	W1-8L	Chevron Alignment	hazard=curve
	W1-8R
	W1-10L	Combination Horizontal Alignment/Intersection	hazard=curve;dangerous_junction
	W1-10R
	W1-10aL	Combination Horizontal Alignment/Intersection	hazard=curve;dangerous_junction
	W1-10aR
	W1-10bL	Combination Horizontal Alignment/Intersection	hazard=curve;dangerous_junction
	W1-10bR
	W1-10cL	Combination Horizontal Alignment/Intersection	hazard=curve;dangerous_junction
	W1-10cR
	W1-10dL	Combination Horizontal Alignment/Intersection	hazard=curves;dangerous_junction curves=serpentine
	W1-10dR
	W1-10eL	Combination Horizontal Alignment/Intersection	hazard=curves;dangerous_junction curves=serpentine
	W1-10eR
	W1-11L	Hairpin Curve	hazard=curve curve=hairpin
	W1-11R
	W1-13L	Truck Rollover	hazard:hgv=rollover	Speculative
	W1-13R
	W1-15	270-degree Loop	hazard=curve curve=loop

W2: Intersections‎

Sign or plaque	Designation	Name	Tags	Notes
	W2-1	Intersection Warning	hazard=dangerous_junction
	W2-2L	Intersection Warning	hazard=dangerous_junction
	W2-2R
	W2-3L	Intersection Warning	hazard=dangerous_junction
	W2-3R
	W2-3aL	Intersection Warning	hazard=dangerous_junction
	W2-3aR
	W2-4	T-intersection	hazard=dangerous_junction
	W2-5	Intersection Warning	hazard=dangerous_junction
	W2-6	Circular Intersection	hazard=roundabout junction=roundabout
	W2-7L	Offset Side Roads	hazard=dangerous_junction
	W2-7R
	W2-8L	Double Side Roads	hazard=dangerous_junction
	W2-8R
	W2-10	Traffic Entering When Flashing	highway=priority at the intersection highway=stop stop=minor at the stop line of the cross street flashing_lights=yes on the traffic sign node
	W2-11	Traffic Approaching When Flashing	highway=priority at the intersection highway=stop stop=minor at the stop line of this street flashing_lights=yes on the traffic sign node

W3: Advance Traffic Control‎

Sign or plaque	Designation	Name	Tags	Notes
	W3-1	Advanced Traffic Control	hazard=stop highway=stop ahead		$1% More details at taginfo More details at taginfo Speculative
	W3-2	Advanced Traffic Control	hazard=give_way highway=give_way ahead	Speculative
	W3-3	Advanced Traffic Control	hazard=traffic_signals highway=traffic_signals ahead	$1% More details at taginfo More details at taginfo
	W3-4	Be Prepared to Stop	hazard=queues_likely
	W3-5	Reduced Speed Limit Ahead	hazard=maxspeed maxspeed=45 mph ahead	Speculative
	W3-5a	XX MPH Speed Zone Ahead	hazard=maxspeed maxspeed=45 mph ahead	Speculative
	W3-5b	Variable Speed Zone Ahead	hazard=maxspeed maxspeed:variable=yes ahead	Speculative
	W3-5c	XX MPH Truck Speed Zone Ahead	hazard=maxspeed maxspeed:hgv=20 mph ahead	Speculative
	W3-6	Draw Bridge	hazard=queues_likely bridge=movable ahead
	W3-7	Ramp Meter Ahead	hazard=traffic_signals highway=traffic_signals traffic_signals=ramp_meter ahead
	W3-8	Ramp Metered When Flashing	hazard=traffic_signals highway=traffic_signals traffic_signals=ramp_meter ahead
	W3-9	Traffic Using Shoulder	shoulder:right:access=*

W4: Lanes and Merges‎

Sign or plaque	Designation	Name	Tags	Notes
	W4-1L	Merge	hazard=merge	Speculative
	W4-1R
	W4-2L	Lane Ends	hazard=merge turn:lanes=merge_to_left change:lanes=yes	Speculative
	W4-2R
	W4-3L	Added Lane	hazard=acceleration_lane lanes=*	Speculative
	W4-3R
	W4-4P	Cross Traffic Does Not Stop (plaque)	hazard=dangerous_crossing highway=stop stop=minor
	W4-4aP	Traffic From Left (Right) Does Not Stop (plaque)	hazard=dangerous_crossing highway=stop stop=minor
	W4-4bP	Oncoming Traffic Does Not Stop (plaque)	hazard=dangerous_crossing highway=stop stop=minor
	W4-5	Entering Roadway Merge	hazard=merge	Speculative
	W4-5aP	No Merge Area (plaque)	hazard=no_acceleration_lane
	W4-6L	Entering Roadway Added Lane	hazard=acceleration_lane lanes=*	Speculative
	W4-6R
File:MUTCD W4-7L.svg	W4-7L	Heavy Merge from Right (Left)	hazard=merge	Speculative
	W4-7R
	W4-8	Single Lane Transition	hazard=road_narrows lanes=1

W5: Road Width Restrictions‎

Sign or plaque	Designation	Name	Tags	Notes
	W5-1	Road Narrows	hazard=road_narrows narrow=yes ahead
	W5-2	Narrow Bridge	narrow=yes on bridge
	W5-2a	Narrow Underpass	narrow=yes on underpass
	W5-3	One Lane Bridge	lanes=1 on bridge
	W5-3a	One Lane Underpass	lanes=1 on underpass
	W5-4	Ramp Narrows	hazard=ramp_narrows narrow=yes ahead	Speculative
	W5-4a	Path Narrows	hazard=road_narrows narrow=yes ahead

W6: Divided Highways‎

Sign or plaque	Designation	Name	Tags	Notes
	W6-1	Divided Highway	dual_carriageway=yes
	W6-2	Divided Highway Ends	dual_carriageway=no
	W6-3	Two-Way Traffic	oneway=no lanes=2
	W6-4	Two-Way Traffic	oneway=no
	W6-5	Two-Way Traffic (3-Lane)	oneway=no lanes=3 lanes:forward=1 lanes:backward=2
	W6-5a	Two-Way Traffic (3-Lane)	oneway=no lanes=3 lanes:forward=2 lanes:backward=1

W7: Hills and Grades‎

Sign or plaque	Designation	Name	Tags	Notes
	W7-1	Hill	incline=down
	W7-1a	Hill with Grade	incline=-8%
	W7-2P	Use Low Gear (plaque)	?
	W7-2bP	Trucks Use Lower Gear (plaque)	?
	W7-3P	XX% Grade (plaque)	incline=-9%
	W7-3aP	Next XX Miles (plaque)	incline=* for 7 miles
	W7-3bP	XX% Grade, XX Miles (plaque)	incline=-9% for 7 miles
	W7-4	Runaway Truck Ramp XX Miles	highway=escape 1 mile ahead
	W7-4b	Runaway Truck Ramp (with arrow)	highway=escape 1 mile ahead
	W7-4c	Truck Escape Ramp	highway=escape
	W7-4dP	Sand (plaque)	surface=sand
	W7-4eP	Gravel (plaque)	surface=gravel
	W7-4fP	Paved (plaque)	surface=paved
	W7-5	Hill	incline=down
	W7-6	Hill Blocks View	?

W8: Pavement and Roadway Conditions‎

Sign or plaque	Designation	Name	Tags	Notes
	W8-1	Bump	traffic_calming=bump hazard=bump
	W8-2	Dip	traffic_calming=dip hazard=dip
	W8-3	Pavement Ends	surface=unpaved
	W8-4	Soft Shoulder	shoulder:surface=unpaved
	W8-5	Slippery When Wet	hazard=slippery
	W8-5,W8-5P	Slippery When Wet	hazard:wet=slippery
	W8-5,W8-5aP	Slippery (Ice)	hazard=slippery;ice
	W8-5,W8-5bP	Slippery (Steel Deck)	hazard=slippery;metal_bridge_deck surface=steel
	W8-5,W8-5cP	Slippery (Excess Oil)	hazard=slippery surface=chipseal
	W8-6	Truck Crossing	hazard=hgv_crossing hgv=designated on cross street	Speculative
	W8-7	Loose Gravel	hazard=loose_gravel surface=gravel
	W8-8	Rough Road	hazard=rough_road smoothness=*
	W8-9	Low Shoulder	?
	W8-10	Bicycle Surface Condition	hazard=slippery surface=*
	W8-10P	Slippery When Wet (plaque)	hazard=slippery surface=*
	W8-11	Uneven Lanes	?
	W8-12	No Center Line	lane_markings=no
	W8-13	Bridge Ices Before Road	hazard=ice on bridge
	W8-14	Fallen Rocks	hazard=falling_rocks
	W8-15	Grooved Pavement	surface=grooved_asphalt hazard=grooves	Speculative
	W8-15,W8-15aP	Grooved Pavement (Motorcycle)	surface=grooved_asphalt hazard:motorcycle=grooves	Speculative
	W8-16	Metal Bridge Deck	surface=metal hazard=metal_bridge_deck on the bridge	Speculative
	W8-16,W8-15P	Metal Bridge Deck (Motorcycle)	surface=metal hazard:motorcycle=metal_bridge_deck on the bridge	Speculative
	W8-17	Shoulder Drop Off (symbol)	?
	W8-17P	Shoulder Drop-Off (plaque)	?
	W8-18	Road May Flood	flood_prone=yes
	W8-19	Flood Gauge	man_made=monitoring_station monitoring:water_level=yes display:analog=yes recording:manually=yes
	W8-21	Gusty Winds Area	hazard=side_winds
	W8-22	Fog Area	hazard=fog	Speculative
	W8-23	No Shoulder	shoulder=no
	W8-24	Steel Plate Ahead	surface=metal ahead
	W8-25	Shoulder Ends	shoulder=no
	W8-26	Road Ends	noexit=yes in 500 feet (150 m)
	W8-26a	Street Ends	noexit=yes in 500 feet (150 m)

W9: Lane Transitions‎

Sign or plaque	Designation	Name	Tags	Notes
	W9-1	Left (Right) Lane Ends	hazard=lane_changing
	W9-2a	Merge Here Take Turns	hazard=road_narrows lanes=1
	W9-3L	Interior Lane Shift	access:lanes=|no|
	W9-3R
	W9-4	Lanes Merge	hazard=road_narrows lanes=1
	W9-5	Bicycle Lane Ends	hazard=lane_changing cycleway=shared_lane or shared
	W9-5a	Bicycles Merging	hazard=lane_changing cycleway=shared_lane or shared
	W9-6	Pay Toll XX Miles Cars (price)	barrier=toll_booth charge:motorcar=0.75 USD 1 mile ahead toll=yes from 1 mile ahead
	W9-6a	Stop Ahead Pay Toll Cars (price)	barrier=toll_booth charge:motorcar=0.75 USD 1 mile ahead toll=yes from up ahead
	W9-6bP	Pay Toll XX Miles Cars (price) (plaque)	barrier=toll_booth charge:motorcar=0.75 USD 1 mile ahead toll=yes from 1 mile ahead
	W9-6cP	Stop Ahead Pay Toll (plaque)	barrier=toll_booth ahead toll=yes from up ahead
	W9-6dP	Stop Ahead Pay Toll (plaque)	barrier=toll_booth ahead toll=yes from up ahead
	W9-6e	Take Ticket XX Miles	amenity=vending_machine vending=toll drive_through=yes 2 miles (3.2 km) ahead toll=yes from 2 miles (3.2 km) ahead
	W9-6f	Stop Ahead – Take Ticket	amenity=vending_machine vending=toll drive_through=yes ahead toll=yes from up ahead
	W9-6gP	Take Ticket XX Miles (plaque)	amenity=vending_machine vending=toll drive_through=yes 2 miles (3.2 km) ahead toll=yes from 2 miles (3.2 km) ahead
	W9-6hP	Stop Ahead – Take Ticket (plaque)	amenity=vending_machine vending=toll drive_through=yes ahead toll=yes from up ahead
	W9-7L	Right (Left) Lane Exit Only Ahead	turn:lanes=slight_left change:lanes=yes highway=motorway_junction ahead
	W9-7R

W10: Rail and Light Rail‎

Sign or plaque	Designation	Name	Tags	Notes
	W10-1	Grade Crossing Advance Warning	hazard=level_crossing railway=level_crossing ahead	$1% More details at taginfo More details at taginfo
	W10-1aP	Exempt (plaque)	?
	W10-2L	Grade Crossing and Intersection Advance Warning	hazard=level_crossing;dangerous_junction railway=level_crossing nearby
	W10-2R
	W10-3L	Grade Crossing and Intersection Advance Warning	hazard=level_crossing;dangerous_junction railway=level_crossing nearby
	W10-3R
	W10-4L	Grade Crossing and Intersection Advance Warning	hazard=level_crossing;dangerous_junction railway=level_crossing ahead
	W10-4R
	W10-5	Low Ground Clearance	hazard=ground_clearance
	W10-5P	Low Ground Clearance (plaque)	hazard=ground_clearance
	W10-7	Light Rail Activated Blank-Out Symbol	?
	W10-8	Trains May Exceed 80 MPH	maxspeed=* on the railroad tracks	highspeed=yes if 124 miles per hour (200 km/h) or higher
	W10-9	No Train Horn	crossing:whistle=optional
	W10-9P	No Train Horn (plaque)	crossing:whistle=optional
	W10-11	Storage Space Symbol	?
	W10-11a	Storage Space XX Feet Between Tracks & Highway	?
	W10-11b	Storage Space XX Feet Between Highway & Tracks Behind You	?
	W10-12	Skewed Crossing	?
	W10-13P	No Gates or Lights (plaque)	railway=level_crossing crossing:barrier=no crossing:light=no
	W10-14P	Next Crossing (plaque)	N/A
	W10-14aP	Use Next Crossing (plaque)	N/A
	W10-15P	Rough Crossing (plaque)	railway=level_crossing smoothness=*
	W10-16	Another Train Coming Activated Blank-Out	railway=level_crossing tracks=*
	W10-21	Busway Crossing	highway=busway intersecting the roadway	How to tag the crossing itself?
	W10-21aP	Signal Ahead (plaque)	highway=traffic_signals at the stop line ahead

W11: Advance Warnings and Crossings‎

Sign or plaque	Designation	Name	Tags	Notes
	W11-1	Bicycle	hazard=cyclists crossing=* bicycle=designated
	W11-2	Pedestrian	hazard=pedestrians crossing=* foot=designated	Ohio distinguishes between left and right orientations $1% More details at taginfo More details at taginfo
	W11-3	Deer	hazard=animal_crossing hazard:animal=deer	$1% More details at taginfo More details at taginfo
	W11-4	Cow	hazard=animal_crossing hazard:animal=cow
	W11-5	Farm Vehicle	hazard=agricultural_vehicles
	W11-6	Snowmobile	hazard=snowmobile
	W11-7	Equestrian	hazard=horse_riders crossing=* horse=designated
	W11-8	Emergency Vehicle	hazard=emergency_vehicles emergency=designated on cross street
	W11-9	Handicapped	hazard=wheelchair crossing=* wheelchair=designated	Speculative
	W11-10	Truck	hazard=hgv hgv=designated on cross street
	W11-11	Golf Cart	hazard=golf_cart crossing=* golf_cart=designated
	W11-12P	Emergency Signal Ahead (plaque)	hazard=traffic_signals highway=traffic_signals traffic_signals=emergency ahead
	W11-14	Horse-Drawn Vehicle	hazard=carriage carriage=designated
	W11-15	Trail Crossing	hazard=cyclists;pedestrians crossing=* bicycle=designated foot=designated
	W11-15a	Trail Crossing	hazard=cyclists;pedestrians crossing=* bicycle=designated foot=designated
	W11-15P	Trail Crossing (plaque)	hazard=cyclists;pedestrians crossing=* bicycle=designated foot=designated
	W11-16	Bear	hazard=animal_crossing hazard:animal=bear
	W11-17	Sheep	hazard=animal_crossing hazard:animal=sheep
	W11-18	Bighorn Sheep	hazard=animal_crossing hazard:animal=bighorn_sheep	Speculative
	W11-19	Donkey	hazard=animal_crossing hazard:animal=donkey	Speculative
	W11-20	Elk	hazard=animal_crossing hazard:animal=elk	Speculative
	W11-21	Moose	hazard=animal_crossing hazard:animal=moose
	W11-22	Wild Horse	hazard=animal_crossing hazard:animal=wild_horse	Speculative

W12: Low Clearance‎

Sign or plaque	Designation	Name	Tags	Notes
	W12-1	Double Arrow	N/A	Map each side as a separate way
	W12-2	Low Clearance Ahead	maxheight=12'6" ahead	$1% More details at taginfo More details at taginfo
	W12-2a	Low Clearance Overhead	maxheight=14'4" on the roadway below	$1% More details at taginfo More details at taginfo
	W12-2b	Low Clearance – Lane Overhead	maxheight:lanes=14'4" on the roadway below

W13: Advisory Speeds‎

Sign or plaque	Designation	Name	Tags	Notes
	W13-1P	Advisory Speed (plaque)	maxspeed:advisory=35 mph
	W13-1aP	Advisory Speed Confirmation (plaque)	maxspeed:advisory=35 mph
	W13-2	Advisory Exit Speed	highway=*_link maxspeed:advisory=25 mph
	W13-3	Advisory Ramp Speed	highway=*_link maxspeed:advisory=35 mph
	W13-4P	On Ramp (plaque)	N/A
	W13-6	Combination Horizontal Alignment/Advisory Exit Speed Loop	hazard=loop highway=*_link maxspeed:advisory=25 mph	Speculative
	W13-7	Combination Horizontal Alignment/Advisory Ramp Speed Loop	hazard=loop highway=*_link maxspeed:advisory=25 mph	Speculative
	W13-8	Combination Horizontal Alignment/Advisory Exit Speed Loop	hazard=loop highway=*_link maxspeed:advisory=25 mph	Speculative
	W13-9	Combination Horizontal Alignment/Advisory Ramp Speed Loop	hazard=loop highway=*_link maxspeed:advisory=25 mph	Speculative
	W13-10	Combination Horizontal Alignment/Advisory Exit Speed Turn	hazard=turn highway=*_link maxspeed:advisory=20 mph	Speculative
	W13-11	Combination Horizontal Alignment/Advisory Ramp Speed Turn	hazard=turn highway=*_link maxspeed:advisory=20 mph	Speculative
	W13-12	Combination Horizontal Alignment/Advisory Exit Speed – Truck Rollover	hazard:hgv=turn highway=*_link maxspeed:advisory=20 mph	Speculative
	W13-13	Combination Horizontal Alignment/Advisory Ramp Speed – Truck Rollover	hazard:hgv=turn highway=*_link maxspeed:advisory=20 mph	Speculative
	W13-20	Vehicle Speed Feedback Sign	highway=speed_display maxspeed=*
	W13-20aP	Vehicle Speed Feedback Sign (plaque)	highway=speed_display maxspeed=*

W14: Dead End Streets and No Passing Zones‎

Sign or plaque	Designation	Name	Tags	Notes
	W14-1	Dead End	N/A	$1% More details at taginfo More details at taginfo
	W14-1aL	Dead End (with arrow)	N/A
	W14-1aR
	W14-2	No Outlet	N/A	$1% More details at taginfo More details at taginfo
	W14-2aL	No Outlet (with arrow)	N/A
	W14-2aR
	W14-3	No Passing Zone	overtaking=no

W15: Playground

Sign or plaque	Designation	Name	Tags	Notes
	W15-1	Playground	hazard=children leisure=playground nearby

W16: Supplemental

Sign or plaque	Designation	Name	Tags	Notes
	W16-1P	In Road (plaque)	cycleway=shared_lane bicycle=designated or carriage=designated
	W16-1aP	In Street (plaque)	cycleway=shared_lane bicycle=designated or carriage=designated
	W16-2P	XX Feet	distance=500' on the traffic sign
	W16-2aP	XX Ft	distance=500' on the traffic sign
	W16-3P	XX Miles (2-line plaque)	distance=2 mi on the traffic sign
	W16-3aP	XX Miles (1-line plaque)	distance=2 mi on the traffic sign
	W16-4P	Next XX Feet (plaque)	distance=500' on the traffic sign
	W16-5PL	Supplemental Arrow (plaque)	N/A
	W16-5PR
	W16-6PL	Supplemental Arrow (plaque)	N/A
	W16-6PR
	W16-7PL	Downward Diagonal Arrow (plaque)	N/A
	W16-7PR
File:MUTCD W16-7Pa.svg	W16-7aP	Dual Downward Diagonal Arrow (plaque)	N/A
	W16-8P	Advance Street Name (1-line plaque)	name=1st Street on cross street
	W16-8aP	Advance Street Name (2-line plaque)	name=Elm Street on cross street at left name=Lumsden Road on cross street at right
	W16-9P	Ahead (plaque)	N/A
	W16-10P	Photo Enforced (symbol plaque)	type=enforcement highway=speed_camera or man_made=surveillance surveillance:type=camera surveillance:zone=traffic
	W16-10aP	Photo Enforced (plaque)	type=enforcement highway=speed_camera or man_made=surveillance surveillance:type=camera surveillance:zone=traffic
	W16-11P	High-Occupancy Vehicles (plaque)	hov=designated
	W16-12P	Traffic Circle (plaque)	hazard=roundabout junction=roundabout
	W16-12aP	Roundabout (plaque)	hazard=roundabout junction=roundabout
	W16-13P	When Flashing (plaque)	?
	W16-15P	New (plaque)	?
	W16-16P	Last Exit Before Toll (1-line plaque)	highway=motorway_junction at the exit toll=yes past the exit
	W16-16aP	Last Exit Before Toll (2-line plaque)	highway=motorway_junction at the exit toll=yes past the exit
	W16-17P	Toll (plaque)	destination:ref=* Toll on a ramp toll=yes on the toll road
	W16-18P	Notice (plaque)	?
	W16-19P	Last in Corridor (plaque)	?
	W16-20P	Except Bicycles (plaque)	except=bicycle
	W16-21P	2-Way Bicycle Cross Traffic (plaque)	highway=cycleway oneway=no across the roadway

W17: Speed Hump‎

Sign or plaque	Designation	Name	Tags	Notes
	W17-1	Speed Hump	traffic_calming=hump

W18: No Traffic Signs‎

Sign or plaque	Designation	Name	Tags	Notes
	W18-1	No Traffic Signs	?

W19: End of Controlled Access Highway‎

Sign or plaque	Designation	Name	Tags	Notes
	W19-1	Freeway Ends XX Miles	End highway=motorway in 1 mile
	W19-2	Expressway Ends XX Miles	End expressway=yes in 1 mile
	W19-3	Freeway Ends	End highway=motorway at this point
	W19-4	Expressway Ends	End expressway=yes at this point
	W19-5	All Traffic Must Exit	highway=construction or highway=proposed ahead

W20: Work Zones

Sign or plaque	Designation	Name	Tags	Notes
	W20-1	Road Work (with distance)	?
	W20-1b	Path Work (with distance)	?
	W20-2	Detour Advance	?
	W20-2a	Bike Detour (with distance)	?
File:MUTCD CW20-2b.svg	W20-2b	Bike Diversion (with distance)	?
	W20-3	Road Closed Advance	access=no ahead
	W20-3a	Path Closed Advance	access=no ahead
	W20-4	One Lane Road Advance	lanes=1 1,000 feet ahead
	W20-5	Lane(s) Closed	access:lanes=|no
	W20-5a	Lane(s) Closed (with distance)	access:lanes=|no|no
	W20-5b	Bike Lane Closed (with distance)	?
	W20-7	Flagger (symbol)	supervised=yes
File:MUTCD CW20-7a.svg	W20-7a	Flagger	supervised=yes
	W20-8	Slow (on Stop/Slow Paddle)	?

W21: Road Work

Sign or plaque	Designation	Name	Tags	Notes
	W21-1	Workers	hazard=roadworks
	W21-1a	Workers	hazard=roadworks
	W21-2	Fresh Oil (Tar)	surface=asphalt smoothness=excellent
	W21-3	Road Machinery Ahead	N/A
	W21-4	Slow Moving Vehicle	N/A
	W21-5	Shoulder Work	?
	W21-5a	Shoulder Closed	shoulder:right:access=no
	W21-5b	Shoulder Closed (with distance)	shoulder:right:access=no 1,000 feet ahead
	W21-6	Survey Crew	N/A
	W21-7	Utility Work Ahead	N/A
	W21-8	Mowing Ahead	N/A

W22: Blasting Zones

Sign or plaque	Designation	Name	Tags	Notes
	W22-1	Blasting Zone Ahead	N/A
	W22-3	End Blasting Zone	N/A

W23: Slow Traffic‎

Sign or plaque	Designation	Name	Tags	Notes
	W23-1	Slow Traffic Ahead	?
	W23-2	New Traffic Pattern Ahead	N/A	Remap roads ahead using newest available imagery
	W23-2a	New Signal Operation Ahead	N/A

W24: Double Reverse Curves

Sign or plaque	Designation	Name	Tags	Notes
	W24-1L	Double Reverse Curve (1 lane)	hazard=curves curves=double_reverse lanes=1	Speculative
	W24-1R
	W24-1aL	Double Reverse Curve (2 lanes)	hazard=curves curves=double_reverse lanes=2 change=no	Speculative
	W24-1aR
	W24-1bL	Double Reverse Curve (3 lanes)	hazard=curves curves=double_reverse lanes=2 change=no	Speculative
	W24-1bR
	W24-1cP	All Lanes	hazard=curves curves=double_reverse lanes=* change=no	Speculative

W25: Oncoming Traffic Has Extended Green‎

Sign or plaque	Designation	Name	Tags	Notes
	W25-1	Oncoming Traffic Has Extended Green	?
	W25-2	Oncoming Traffic May Have Extended Green	?

W26: Watch for Stopped Traffic

Sign or plaque	Designation	Name	Tags	Notes
	W26-1	Watch for Stopped Traffic	hazard=congestion

External links

• 11th Edition Chapter 2C. Warning Signs And Object Markers
• 11th Edition Subchapter 2F.06–11. Warning Signs
• 11th Edition Chapter 6F. Temporary Traffic Control Zone Signs – General
• 11th Edition Chapter 6O. Control Of Traffic Through Traffic Incident Management Areas
• 11th Edition Chapter 8B. Signs
• Signing for Designated Alternative Fuels Corridors
• Diagrams of warning road signs of the United States
• Diagrams of construction road signs of the United States
• Diagrams of U.S. Incident Management Area Signs