Do not enter
Entry into this roadway or lane is prohibited.
What to do: Do not drive past this sign in this direction.
Shape: circle · Color: red
Handbook p. 45 ↗Idaho road signs
Idaho road signs and meanings.
Explore 62 signs and driving illustrations from this course’s handbook edition. Each entry pairs the image with its meaning and a practical action. Use your browser’s Find command to look up a name or a word from a meaning.
Look, recognize, act
Notice the shape and color before reading a sign’s words or symbol. Then connect its meaning with what you should do: stop, yield, adjust your speed, choose a lane, or prepare for a hazard. Signals, markings, and diagrams are included where the handbook uses them to explain a driving rule.
Use the source page link for the surrounding rule. Some illustrations show a complete road situation rather than a standalone roadside sign.
Your handbook sign library
62 entries. Sign images and page references belong to the handbook edition used for the Idaho course.
Keep right
Keep right of the island, median or obstruction ahead.
What to do: Stay to the right of the marked obstruction as you pass it.
Shape: rectangle vertical · Color: white
Handbook p. 45 ↗
Lane-use control sign (left, straight, right only)
Shows which turns each lane must make ahead.
What to do: Get into the lane matching the turn or direction you want.
Shape: rectangle horizontal · Color: white
Lane-use control sign (left turn only, through lanes)
Shows which turns each lane must make ahead.
What to do: Get into the lane matching the turn or direction you want.
Shape: rectangle vertical · Color: white
No bicycles
Bicycles are not allowed on this roadway.
What to do: Do not ride a bicycle here; use an alternate route.
Shape: square · Color: white
No drinking and driving
Warns against driving after drinking alcohol.
What to do: Never drive after drinking; arrange another way home.
Shape: rectangle vertical · Color: white
No parking
Parking is not allowed in this area.
What to do: Do not park your vehicle in the marked zone.
Shape: rectangle vertical · Color: white
Handbook p. 81 ↗
No passing zone
Passing other vehicles is not allowed in this zone.
What to do: Stay behind slower traffic; do not pass until the zone ends.
Shape: pennant · Color: yellow
No U-turn
U-turns are prohibited here.
What to do: Do not make a U-turn at this location.
Shape: square · Color: white
Handbook p. 136 ↗
Reserved parking (accessible)
Marks a parking space reserved for persons with disabilities.
What to do: Only park here if you have a valid accessible parking permit or plate.
Shape: rectangle vertical · Color: blue
Handbook p. 82 ↗
Stop
Come to a complete stop.
What to do: Stop fully at the line, crosswalk or intersection edge; go only when safe.
Shape: octagon · Color: red
Handbook p. 44 ↗
Yield
Slow down and let other traffic or pedestrians go first.
What to do: Slow or stop if needed and yield the right-of-way before proceeding.
Shape: triangle · Color: red
Handbook p. 44 ↗
Added lane
An additional lane begins ahead without merging.
What to do: Continue in your lane; no need to merge for the new lane.
Shape: diamond · Color: yellow
Handbook p. 50 ↗
Crossroad
Warns of an intersecting road ahead.
What to do: Slow down and watch for crossing traffic at the intersection.
Shape: diamond · Color: yellow
Handbook p. 49 ↗
Curve right
Road curves to the right ahead.
What to do: Slow down and steer smoothly through the right curve.
Shape: diamond · Color: yellow
Deer crossing
Warns that deer may cross the road in this area.
What to do: Slow down and watch for deer, especially at dawn and dusk.
Shape: diamond · Color: yellow
Handbook p. 53 ↗
Divided highway begins
Road ahead splits into a divided highway with a median.
What to do: Keep right of the median and stay alert for the lane split ahead.
Shape: diamond · Color: yellow
Handbook p. 51 ↗
Divided highway ends
Divided highway ahead merges back into a two-way road.
What to do: Move back toward the right and be ready to meet oncoming traffic.
Shape: diamond · Color: yellow
Handbook p. 51 ↗
Flood area (Turn Around Don't Drown)
Warns that the road ahead may flood; do not drive into flood water.
What to do: Turn around and take another route if the road is flooded.
Shape: rectangle vertical · Color: orange
Hill
A steep downhill grade is ahead.
What to do: Shift to a lower gear and control speed going downhill.
Shape: diamond · Color: yellow
Handbook p. 52 ↗
Left lane ends
The left lane ends ahead and traffic must merge.
What to do: Merge right safely before your lane ends.
Shape: diamond · Color: yellow
Low clearance
Warns of a low overhead clearance ahead, such as a bridge or tunnel.
What to do: Do not proceed if your vehicle height exceeds the posted clearance.
Shape: diamond · Color: yellow
Handbook p. 51 ↗
Merge
A lane from the side joins your road ahead.
What to do: Adjust speed and merge safely; yield to traffic already in your lane.
Shape: diamond · Color: yellow
Handbook p. 50 ↗
Open range (cattle crossing)
Warns that livestock may be on or near the roadway in open range areas.
What to do: Slow down and watch for animals that may enter the road.
Shape: diamond · Color: yellow
Handbook p. 49 ↗
Pedestrian crossing
Pedestrians may be crossing the road ahead.
What to do: Slow down and yield to any pedestrians in or near the crosswalk.
Shape: diamond · Color: yellow
Handbook p. 51 ↗
Playground
A playground area is near the road ahead.
What to do: Slow down and watch for children playing near the road.
Shape: diamond · Color: yellow
Reverse curve
Road curves right then left ahead.
What to do: Slow down and steer carefully through both curves.
Shape: diamond · Color: yellow
Reverse turn
The road makes a sharp turn one way then the other.
What to do: Slow down and steer carefully through both turns.
Shape: diamond · Color: yellow
Right lane ends
The right lane ends ahead and traffic must merge.
What to do: Merge left safely before your lane ends.
Shape: diamond · Color: yellow
Handbook p. 50 ↗
Roundabout ahead
A roundabout is ahead where traffic circles counterclockwise.
What to do: Slow down and yield to traffic already in the roundabout.
Shape: diamond · Color: yellow
Signal ahead
Warns of a traffic signal ahead, often on higher-speed roads.
What to do: Be ready to slow down and stop for the signal ahead.
Shape: diamond · Color: yellow
Handbook p. 49 ↗
Slippery when wet
Road may be slick from rain, ice or oil.
What to do: Slow down, avoid sudden braking or sharp turns, and increase following distance.
Shape: diamond · Color: yellow
Handbook p. 52 ↗
Slow down
Warns drivers to reduce speed for an upcoming hazard or condition.
What to do: Reduce your speed as instructed by the sign.
Shape: rectangle horizontal · Color: yellow
Handbook p. 48 ↗
Slow-moving vehicle emblem
Marks a vehicle that travels 25 mph or slower, such as farm equipment.
What to do: Slow down early and pass with care when safe.
Shape: triangle · Color: orange
Handbook p. 47 ↗
T intersection
The road ahead ends in a T-shaped intersection.
What to do: Slow down and prepare to turn left or right.
Shape: diamond · Color: yellow
Handbook p. 49 ↗
Two-way traffic
Warns you are entering a two-way road after a divided or one-way section.
What to do: Keep to the right and watch for oncoming traffic.
Shape: diamond · Color: yellow
Handbook p. 50 ↗
Winding road
The road has several curves ahead.
What to do: Slow down and drive carefully through the series of curves.
Shape: diamond · Color: yellow
Y intersection
The road ahead forks into a Y-shaped intersection.
What to do: Slow down and choose the correct branch of the fork.
Shape: diamond · Color: yellow
School speed limit when flashing
Shows the reduced school-zone speed limit when the beacon flashes.
What to do: Slow to the posted speed only while the beacon is flashing.
Shape: rectangle vertical · Color: yellow
School zone
You are approaching a school area or crossing.
What to do: Slow down, watch for children, and be ready to stop.
Shape: pentagon · Color: yellow
Handbook p. 50 ↗
Railroad crossing ahead
Warns of a railroad crossing ahead.
What to do: Slow down, look and listen for trains before crossing the tracks.
Shape: circle · Color: yellow
Handbook p. 52 ↗
Railroad emergency notification sign
Gives a phone number and crossing ID to report railroad problems.
What to do: Call the posted number to report a stalled vehicle or hazard at the crossing.
Shape: rectangle horizontal · Color: blue
Handbook p. 53 ↗
Barricade with warning light
Striped barricade with a flashing light marking a work zone hazard.
What to do: Slow down and steer clear of the marked hazard.
Shape: other · Color: orange
Handbook p. 54 ↗
Flagger ahead
A worker will direct traffic ahead.
What to do: Slow down and be ready to stop or follow the flagger's directions.
Shape: diamond · Color: orange
Handbook p. 47 ↗
Reverse curve (work zone lane shift)
Warns of a temporary S-shaped lane shift through a work zone.
What to do: Slow down and steer through the shifted lane path carefully.
Shape: diamond · Color: orange
Handbook p. 46 ↗
Road closed
The road ahead is closed to all traffic.
What to do: Do not proceed; turn around or follow the detour.
Shape: diamond · Color: orange
Handbook p. 47 ↗
Road work ahead
Construction or maintenance work is ahead on the road.
What to do: Slow down and watch for workers, equipment and lane changes.
Shape: diamond · Color: orange
Type III barricade
Large striped barricade marking a road closure in a work zone.
What to do: Do not drive past the barricade; follow the marked detour.
Shape: other · Color: orange
Handbook p. 54 ↗
Workers ahead
Road workers are working near or in the roadway.
What to do: Slow down and watch for workers and equipment.
Shape: diamond · Color: orange
Accessible facility
Marks a facility or space accessible to people with disabilities.
What to do: Use as directed; reserve marked accessible spaces for permit holders.
Shape: square · Color: blue
Boat launch (boat ramp)
Indicates a boat launching ramp is available.
What to do: Follow signage if you need to launch a boat; otherwise no action needed.
Shape: square · Color: brown
Bike lane
White pavement marking with a bicycle symbol marks a dedicated bike lane.
What to do: Do not drive or park in the bike lane; watch for cyclists.
Shape: n/a · Color: n/a
Handbook p. 59 ↗
Bike lane (dashed guide line)
Dashed white line and bicycle symbol guide cyclists through a lane conflict area.
What to do: Yield to cyclists and watch for them when crossing the dashed bike lane guide line.
Shape: n/a · Color: n/a
Handbook p. 59 ↗
Bike lane (green pavement)
Green-colored pavement with a bicycle symbol emphasizes a dedicated bike lane.
What to do: Do not drive or park in the green bike lane; watch for cyclists.
Shape: n/a · Color: n/a
Handbook p. 60 ↗
Broken white lane line
Separates lanes of traffic moving in the same direction.
What to do: You may cross a broken white line to change lanes when safe.
Shape: n/a · Color: n/a
Handbook p. 59 ↗
Broken white line
Separates lanes of traffic moving in the same direction.
What to do: You may cross a broken white line to change lanes when safe.
Shape: n/a · Color: n/a
Handbook p. 59 ↗
Broken yellow center line
Passing is allowed on a two-way road when safe.
What to do: Pass only when the way is clear and it is safe to do so.
Shape: n/a · Color: n/a
Handbook p. 58 ↗
Double solid white lines
Two solid white lines mean lane changes across them are not allowed.
What to do: Do not cross a double solid white line to change lanes.
Shape: n/a · Color: n/a
Handbook p. 59 ↗
Shared lane marking (sharrow)
Shows where cyclists may share a travel lane with vehicles.
What to do: Expect cyclists in this lane and pass them safely with adequate room.
Shape: n/a · Color: n/a
Handbook p. 58 ↗
Solid and broken yellow lines
Marks a two-way road where passing is allowed only from one side.
What to do: Pass only when the broken yellow line is on your side of the road.
Shape: n/a · Color: n/a
Handbook p. 58 ↗
Solid yellow center line
No passing is allowed on the side with the solid yellow line.
What to do: Do not pass when a solid yellow line is on your side of the road.
Shape: n/a · Color: n/a
Handbook p. 58 ↗
Two-way left turn lane markings
A shared center lane for left turns from either direction.
What to do: Use this lane only to turn left or wait to turn; do not drive through it.
Shape: n/a · Color: n/a