Signs, Pavement Markings and Signals: Sign Shapes and Colors, Route Markers, Regulatory and Warning Signs, White and Yellow Lines, Bicycle and Shared Lanes, Left Turn Center Lanes, Michigan Lefts, Yield Lines, Traffic Signals, the Doghouse and Flashing Yellow Arrow Signals, Pedestrian Signals and Hybrid Beacons
Written for aiforu2 as the source for a practice-test bank and the on-device tutor for the Michigan driver's license written knowledge test. The facts follow the official manual; the wording is ours.
Source: What Every Driver Must Know (SOS-133, revised October 2025), Michigan Department of State, chapter 5 "Signs, Pavement Markings and Signals" (pp. 41–51).
Sign shapes
A sign's shape hints at its meaning. Michigan's nine basic shapes: the octagon means stop; the triangle (point down) means yield; the diamond warns; the pentagon marks a school; the pennant warns and marks a no-passing zone; the horizontal rectangle gives directions; the vertical rectangle states the law; the round sign warns of a railroad crossing; and the crossbuck marks the crossing itself. Detroit had the first stop sign in 1915 and the first red-yellow-green four-way signal in 1920; Michigan painted the first highway center line in 1917.
Sign colors and route markers
Red means stop, prohibited or forbidden; blue service and hospitality; green directions and guidance; yellow caution and general warning; orange caution for construction or maintenance; black and white regulatory, what is legally allowed or prohibited; fluorescent yellow-green school, pedestrian or bicycle caution; fluorescent pink an incident, emergency or unplanned event; and brown recreation or cultural interest. Route markers identify interstate freeways (the shield), U.S. highways, state highways (Michigan's M routes) and county routes. Regulatory signs, usually rectangular in white and black, red, white and black, or red and white, set speed and movement rules.
What common signs mean
Stop requires a complete stop and yielding to traffic and pedestrians; Yield means slow and let crossing vehicles go; No Turn on Red, No Right Turn, No U-Turn, Do Not Pass and No Trucks prohibit those acts; Left Turn Lanes and Center Lane Left Turn Only regulate which lane turns left; Pass With Care, on the right side, ends a no-passing zone; Keep Left sends traffic left of an obstruction; Do Not Enter and Wrong Way mean you are entering or already in oncoming traffic; One Way means every lane moves the same direction; Authorized Vehicles Only marks a freeway median crossover for police, emergency and maintenance vehicles only, never for turning around; Speed Limit 50 sets the limit; Parking Permitted allows two-hour parking in the posted hours; and the wheelchair sign reserves parking for people with disabilities.
Warnings: Incident Ahead (pink) means an emergency has disrupted traffic; Bridge Ices Before Road; School Children Present and School Crossing, where you obey the crossing guard; the slow-moving vehicle orange triangle on vehicles that cannot exceed 25 mph such as Amish buggies and combines; Road Turns Left, Road Curves Ahead (sharply left then right), Winding Curve Ahead with an advisory limit; RR crossing ahead and the crossbuck with a plaque for three tracks; Watch for Bicyclists and Watch for Pedestrians; Obstacle in Roadway (a traffic island, drive to either side); Maximum Height Allowed (a 12-foot 6-inch clearance); Exit 25 mph; the No Passing Zone pennant on the left side; Intersection Ahead, Side Road Ahead, Roundabout Ahead, Road Work Ahead (orange), Stop Ahead, Yield Ahead, Merging Traffic from the right, Lane Ends Merge Left (yield to the left lane), Right Lane Ends in 500 feet, Divided Highway Ends, Two-Way Traffic (keep right), Hill (check brakes, gear down), Slippery When Wet, and Bicyclists and Pedestrians crossing. Service signs show gas stations, exits and rest areas; brown signs point to places such as national parks; green signs give directions to communities.
Pavement markings
Markings are white or yellow and warn, regulate and inform. White lines separate lanes moving the same direction: broken white lines divide lanes (do not straddle them); solid white lines mark the right edge ("fog lines") and lanes where changing is dangerous, such as sharp curves and acceleration and deceleration lanes, and it is illegal to cross a solid white line to pass; double solid white lines may not be crossed at all. Solid white crosswalk lines cross the pavement at intersections and mid-block, and you stop behind them. Wide white stop lines mark where to stop; without one, stop before entering the intersection where you can see all directions. White directional arrows in a lane require the movement shown, such as right turn only. A bicycle lane is reserved for bicycles; a green bicycle lane marks a conflict point at intersections and driveways, and it is illegal to drive, pass, turn right, park or pull over in a bike lane. Shared lane markings remind you to give bicyclists room.
Yellow lines separate opposite directions. A single broken yellow center line allows passing when safe; a solid yellow on your side forbids passing; on a divided or one-way road a solid yellow marks the left edge; a double solid yellow bans passing both ways, though you may cross it to turn into a driveway, onto a crossroad or into a parking spot. A left turn only center lane has a solid yellow outer line and broken yellow inner lines on each side; left turns are made from inside it from either direction, and using it to pass or merge is illegal.
Michigan Lefts
Michigan Lefts, or indirect left turns, date from the late 1960s. At such an intersection you may not turn left directly: drive through the intersection, turn left into the median crossover, then turn left back onto the highway; or turn right, move to the far left lane, and use the crossover to reverse direction. A single-lane crossover carries one vehicle at a time (its width is for trucks and RVs); a multi-lane crossover shows arrows, ONLY lettering and white lines; an unmarked crossover is always single-lane.
Yield lines and traffic signals
White triangles across a lane at roundabouts and mid-block crosswalks mean be ready to stop and yield to pedestrians; dashed white lines across a lane mark the edge of a roundabout's circular lane. It is illegal to cut across public or private property such as a parking lot to avoid a traffic control device.
Red, at the top of every Michigan signal, means stop behind the crosswalk or stop line. Yellow means the signal is about to turn red and you are required to stop; if you cannot stop safely, do not speed up but drive through cautiously. Green means proceed with caution after checking for pedestrians and vehicles. A dark signal with no officer present is treated as a stop: stop, yield to vehicles already there, and to the right when arriving together. The five-section "doghouse" signal controls turns: a green arrow is a protected turn with conflicting traffic stopped; a green ball lets you turn once oncoming traffic clears; a yellow light or arrow means stop unless you are already in the intersection, then finish with caution; red means a full stop, checking cross traffic and pedestrians before going on green or turning right on red. A flashing red means a full stop, then go when clear; a flashing yellow means proceed carefully, scanning both ways. The flashing yellow arrow head has four lenses: solid red arrow, stop, no turn; solid yellow arrow, the left-turn signal is ending, stop unless already inside with no conflict; flashing yellow arrow, turn left when oncoming traffic (which has green) and pedestrians and bicyclists are clear; solid green arrow, oncoming traffic is stopped, turn with caution yielding to the crosswalk. Sensor-equipped intersections may skip the arrow phase when no one is waiting to turn.
Pedestrian signals and hybrid beacons
The white walking figure or WALK means traffic yields and pedestrians may cross; a flashing signal (often with a countdown) means the crossing time is ending, and anyone already in the crosswalk finishes; DON'T WALK or the red hand means do not cross. Drivers always yield to pedestrians. A Pedestrian Hybrid Beacon alerts drivers to pedestrians through a six-step sequence: dark until activated, flashing yellow, steady yellow, steady red while pedestrians cross, alternating flashing red during which you may proceed after a complete stop once the crosswalk is clear, then dark again.
Practise this with Michigan Driver License questions
More of this guide
Operator's, chauffeur's and commercial licenses and endorsements, REAL ID, converting an out-of-state license, GDL Segments 1 and 2 and Levels 1, 2 and 3 with their hours, curfew and passenger limits, the 180-day TIP and 30-day practice rule for adults, required documents, vision and knowledge tests, the driving skills test, health restrictions, probation, name and address changes, four-year renewals, voter registration and state ID cards.
How long convictions stay on the record, the 6-, 4-, 3- and 2-point violations, the 12-point reexamination, standard drinks, drug-conviction suspensions of six months and one year, marijuana transport and driving rules, implied consent, OWI penalties of 93 days, $500 and six points, and driver reexaminations.
The hands-free law and its $100 and $250 fines, Kelsey's Law, Click It or Ticket, car seats until 8 or 4 feet 9 inches, rear seats under 4, pickup beds, unattended children, air bags, the Basic Speed Law and the 15, 25, 55, 70 and 45 mph limits, doubled work-zone fines and points, green maintenance lights, the Move Over law's 10 mph rule, 500 feet behind emergency vehicles and stopping 20 feet from a school bus.
Yielding when turning and at intersections, left turns on red, four-way stops and dark signals, funeral processions, pedestrian right of way, passing on the left and right and where passing is prohibited, right-lane rules, turning and lane changes, roundabouts, stopping 15 to 50 feet from the tracks and the 20-second rule, parking on hills, parallel parking, disability parking and the full list of no-parking distances.
Truck stopping distances of 400 feet, no zones, wide right turns, passing a truck, the slow-moving vehicle triangle and horse-drawn buggies, yielding to pedestrians and white canes, the 3-to-4-second gap behind riders, wind blast and engine braking, the ban on sharing a lane with a motorcycle, the moped definition, the 3-foot bicycle passing law, green bike lanes and autocycles.
Aggressive driving and road rage, intersections, freeway rules and who yields when merging, HOV lanes, missed exits, fatigue breaks, cruise control, an oncoming vehicle in your lane, the first half hour of rain, hydroplaning, floods, fog, ice, skids, ABS and threshold braking, the 3-to-4-second rule, headlights at 500 feet, crashes and the $1,000 report, deer crashes, vehicle security, breakdowns and what to do when pulled over.