The 37 road signs, signals and markings the Colorado Driver Handbook (DR 2337) teaches, each drawn as it looks on the road, with what it means.
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Red signs stop you or forbid something. White signs state a law you must obey.
Restricted to high-occupancy vehicles during the posted hours.
White diamond symbol on the sign and painted in the lane.
Yield to trains. This is the rail equivalent of a yield sign.
White X-shaped sign at the crossing itself. A plate below shows the number of tracks.
You may not drive past this point in this direction.
White square with a red circle and a white bar across it.
No left turn from this point, in this direction.
Left arrow in a red circle-slash.
No right turn here, red light or green.
Right arrow in a red circle-slash.
The usual permission to turn on red is cancelled here.
A white sign with the words NO TURN ON RED.
You may not reverse direction here.
Black U-arrow in a red circle-slash.
Traffic moves only in the arrow's direction.
Black-and-white horizontal arrow rectangle.
Parks, campgrounds, historical and scenic sites.
Brown rectangle.
25 mph is the maximum in ideal conditions — not a target.
Black-on-white vertical rectangle. White regulates, yellow only warns.
Maximum legal speed on this freeway in good conditions.
Black-on-white regulatory rectangle.
Come to a complete stop. Wheels must stop rolling.
Red octagon — the only octagon on the road. Recognizable from the back and in the dark.
You are traveling against traffic. Get off the road immediately.
Red rectangle, white text.
Give way to traffic and pedestrians already there. Slow down, and stop if you must.
Red-and-white downward triangle — the only downward triangle.
Yellow diamond signs warn you about what is ahead.
A bike route or path crosses or joins the roadway here.
Yellow diamond with a bicycle symbol.
Same message as the yellow version, upgraded because the conflict is frequent or has caused crashes.
Fluorescent yellow-green diamond.
A curve is coming at roughly the advisory speed.
Yellow diamond with a bending arrow. An advisory speed plate may hang below.
A person will direct traffic ahead.
Orange diamond with a person holding a flag or paddle.
Another stream of traffic may join yours. A merging driver must yield.
Yellow diamond, two lines joining.
You are entering a no-passing zone.
Yellow pennant — a sideways triangle. Mounted on the LEFT side of the road.
People cross here, often mid-block.
Yellow (or fluorescent yellow-green) diamond with a walking figure.
A railroad crossing is ahead. Shape alone identifies it.
Yellow CIRCLE with an X and RR — the only round sign on the road.
A work zone is ahead. Conditions differ from the permanent signs.
An orange sign with black letters. It may say ahead or a distance.
The surface loses grip in rain, frost or fog.
Yellow diamond with a car and skid marks.
A long or steep descent is ahead.
Yellow diamond with a truck on a slope, often with a percentage plate.
The five-sided shape is reserved for school.
School zone — children crossing.
A five-sided sign pointing up, in yellow or fluorescent green.
This vehicle is designed to travel slower than 25 miles per hour.
A reflective orange triangle on the rear of a vehicle.
Follow a person directing traffic, even if the light shows something else.
Turn left with caution, and yield to oncoming traffic and pedestrians.
Flashing amber arrow lens.
A green arrow means you need not yield to oncoming traffic.
Green arrow lens.
You may proceed if the intersection is clear.
Green lens, bottom of the head.
Stop until a green light appears. You may also turn right on red after you stop and yield to pedestrians and other traffic, unless a sign forbids it.
Red lens, top of the signal head.
A red light is about to appear. Stop unless you are already in the intersection.
Amber lens, center of the head.
When a sign and the paint disagree, follow the sign. The paint still shows where you may drive.
This lane may only be used for the movement shown.
White arrow painted in the lane, sometimes with the word ONLY.
The solid white line across your lane that shows where to stop.
Green, blue and brown signs show directions, services and places of interest.
Directions, distances and exits. Green never imposes a duty.
Green rectangle, white lettering.
A hospital open 24 hours a day, 7 days a week.
Blue rectangle with a white H.
Facilities ahead — restrooms, parking, sometimes fuel and food.
A blue sign with white words and a white border.
From the Colorado Driver Handbook (DR 2337)
Edition: DR 2337 (12/05/24), posted as the January 2025 handbook; the current edition on dmv.colorado.gov/drivereducation on 2026-10-30. We read it on October 30. Read it at the DMV. We're an independent study app and aren't connected to the DMV or any state agency. Rules change, so check anything that matters to you with the DMV.
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