2.3 Traffic Signals, Lane Markings & Pavement Arrows
Key Takeaways
- Traffic signals govern intersection flow; Michigan law permits right turns on steady red after a complete stop unless prohibited, as well as left turns on steady red when turning from a one-way OR two-way street onto a one-way street traveling left.
- Flashing yellow arrows indicate an unprotected turn where drivers may proceed only after yielding to oncoming traffic and crossing pedestrians; flashing red lights require a complete stop identical to a stop sign.
- When traffic signals are completely non-functional or dark due to power outages, Michigan law (MCL 257.649(4)) requires drivers to treat the intersection as an All-Way Stop.
- Longitudinal yellow pavement markings separate opposing traffic (broken = passing permitted; double solid = no passing), while white markings separate lanes moving in the same direction and establish roadway boundaries (fog lines, bike lanes, stop bars).
- Center Two-Way Left-Turn Lanes (shared left-turn lanes) are reserved exclusively for executing left turns and cannot be used for passing, through travel, or continuous driving exceeding reasonable turning distance.
Last updated: August 2026
Traffic Signals, Lane Markings & Pavement Arrows
Traffic signals and pavement markings provide continuous, real-time control over multi-modal traffic streams. On Michigan roadways, intersection signals and roadway line markings operate under the statutory framework of the Michigan Vehicle Code (MCL 257.612 through MCL 257.649(4)).
Mastering signal illuminations, permissive versus protected turning phases, longitudinal striping, and shared roadway markings is essential for collision prevention and passing the state licensing examination.
1. Traffic Signal Light Indications & Driver Obligations
Modern intersection signals employ standardized tri-color vertical arrangements (Red at top, Yellow in middle, Green at bottom) or horizontal arrangements (Red at left, Yellow in middle, Green at right).
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| INTERSECTION TRAFFIC SIGNAL MODES |
| |
| [STEADY RED] [STEADY YELLOW] [STEADY GREEN] |
| - Stop behind line - Caution: Red imminent - Go if path clear |
| - Right turn on red OK* - Stop if safe to do so - Yield to in-junction|
| - Left turn on red OK** - Clear intersection - Yield to pedestrians|
| |
| [FLASHING RED] [FLASHING YELLOW] [DARK / UNLIT SIGNAL] |
| - Complete Stop - Slow down & proceed - Complete Power Loss |
| - Treat as Stop Sign - Caution / Scan hazards - Treat as ALL-WAY |
| - Yield right-of-way - No stop required STOP (MCL 257.649(4)) |
| |
| * Unless prohibited by "No Turn on Red" sign |
| ** From one-way OR two-way street onto a ONE-WAY street going left |
+-----------------------------------------------------------------------------+
Signal States and Legal Actions
| Signal Display | Legal Status | Mandatory Driver Behavior |
|---|---|---|
| Steady Red | Complete Stop | Stop completely behind the stop bar, crosswalk, or intersection boundary. Vehicles may turn right after a complete stop unless prohibited. |
| Steady Yellow | Transition Warning | Indicates the green phase is terminating and red is imminent. Stop safely before the intersection. If stopping cannot be done safely, proceed with caution through the intersection. |
| Steady Green | Go / Permissive | Proceed straight or turn if in an authorized lane, yielding to vehicles and pedestrians already lawfully within the intersection. |
| Flashing Red | Stop Sign Equivalent | Bring the vehicle to a full, complete stop. Scan for cross traffic, yield the right-of-way, and proceed only when completely safe. |
| Flashing Yellow | Caution / Warning | Slow down, proceed with caution, and scan for crossing traffic or pedestrians. A complete stop is not required unless yielding. |
| Steady Red Arrow | Prohibited Turn | Turning in the direction of the arrow is strictly prohibited. Motorists must remain stopped until a green arrow or green signal appears. |
| Steady Yellow Arrow | Protected Phase Ending | Warns that the protected turning phase is ending. Prepare to stop or yield to oncoming traffic. |
| Flashing Yellow Arrow | Unprotected / Permissive Turn | Turning in the arrow direction is permitted; however, the driver MUST yield the right-of-way to oncoming traffic and pedestrians before turning. |
| Steady Green Arrow | Protected Turn | Turn in the direction of the arrow. Oncoming traffic faces a steady red light; turning vehicles have protected right-of-way. |
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| FLASHING YELLOW ARROW TURNING SEQUENCE |
| |
| [SOLID GREEN ARROW] ---> Protected turn: Oncoming traffic has red light. |
| | |
| v |
| [SOLID YELLOW ARROW] ---> Phase ending: Clear intersection or prepare stop|
| | |
| v |
| [FLASHING YELLOW ARROW]-> Permissive turn: MUST YIELD to oncoming traffic |
| and crossing pedestrians before turning. |
| | |
| v |
| [SOLID RED ARROW] ---> STOP: No turning permitted in that direction. |
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Special Michigan Left Turn on Red Rule
Under MCL 257.612(1)(c)(ii), Michigan law contains a unique provision regarding left turns on steady red lights:
- Right Turn on Red: Permitted from any lane after a complete stop and yielding to traffic/pedestrians, unless a "No Turn on Red" sign is posted.
- Left Turn on Red: A driver may execute a left turn on a steady red light when turning onto a one-way street carrying traffic in the direction of the left turn.
- This turn is legal whether turning from a one-way street OR from a two-way street.
- The driver must come to a full stop first and yield to all oncoming traffic and crossing pedestrians.
Inoperative or Dark Signals (MCL 257.649(4))
When a traffic signal is totally unlit or non-functioning due to a municipal power outage or storm damage:
- Michigan law mandates that the intersection must be treated as an All-Way Stop.
- Every driver must come to a full stop before entering and yield according to standard four-way stop right-of-way rules (first vehicle to arrive proceeds first; if arriving simultaneously, yield to the vehicle on the right).
2. Longitudinal Pavement Markings: Yellow vs. White Lines
Pavement markings utilize colors and line styles to delineate travel lanes, manage passing zones, and establish roadway edges.
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| LONGITUDINAL PAVEMENT MARKINGS |
| |
| [YELLOW LINES: OPPOSING TRAFFIC] [WHITE LINES: SAME-DIRECTION] |
| |
| Broken Yellow: Broken White: |
| <--- [Lane 1] ---> [Lane 1] |
| - - - - - - - (Passing Permitted) - - - - - - - (Lane Change OK) |
| ---> [Lane 2] ---> [Lane 2] |
| |
| Solid + Broken Yellow: Solid White (Fog Line / Turn): |
| <--- [Lane 1] (No Passing) ================= (Discouraged) |
| --------------------------------- ---> [Lane 1] |
| - - - - - - - - - - - - - - - - - |
| ---> [Lane 2] (Passing OK) Double Solid White: |
| ================= (PROHIBITED) |
| Double Solid Yellow: ================= |
| <--- [Lane 1] ---> [HOV / Managed Lane] |
| ================================= |
| ================================= (No Passing Either Direction) |
| ---> [Lane 2] |
+-----------------------------------------------------------------------------+
Longitudinal Markings Detailed Reference
| Marking Pattern | Color | Traffic Separation | Legal Rules & Maneuvers |
|---|---|---|---|
| Broken Yellow Line | Yellow | Opposing Directions | Passing and left turns permitted in both directions when the oncoming lane is clear. |
| Solid Yellow + Broken Yellow | Yellow | Opposing Directions | Passing permitted only for traffic adjacent to the broken line. Traffic on the solid side cannot pass. |
| Double Solid Yellow Lines | Yellow | Opposing Directions | Passing prohibited in both directions. Drivers may only cross to make a lawful left turn into a driveway or street. |
| Broken White Line | White | Same Direction | Separates lanes of traffic traveling in the same direction. Lane changing is permitted when safe. |
| Solid White Line | White | Same Direction / Roadway Edge | Marks right shoulder (fog line) or lane boundaries. Lane changing is discouraged; crossing requires extreme caution. |
| Double Solid White Lines | White | Same Direction | Lane changing or crossing is strictly prohibited. Used to separate high-occupancy vehicle (HOV) lanes and freeway exit gore areas. |
3. Center Two-Way Left-Turn Lanes ("Suicide Lanes")
A Center Two-Way Left-Turn Lane is a shared middle lane marked on both sides by a solid yellow outer line and a broken yellow inner line.
+-----------------------------------------------------------------------------+
| CENTER TWO-WAY LEFT-TURN LANE SETUP |
| |
| <--- WESTBOUND THROUGH LANE <------------------------------------------ |
| ======================================================================= |
| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| |---\ /---| |
| \---/ [SHARED TWO-WAY LEFT-TURN LANE ONLY] \---/ |
| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - |
| ======================================================================= |
| ---> EASTBOUND THROUGH LANE ------------------------------------------> |
+-----------------------------------------------------------------------------+
Rules for Proper Operation:
- Exclusive Turning Function: Reserved solely for making left turns into or out of driveways, businesses, and side streets.
- Never a Travel Lane: It is illegal to drive in this lane as a continuous travel lane or to pass slower vehicles.
- Reasonable Entry Distance: Enter the lane only within a reasonable distance (typically within 100–200 feet) before your intended left turn.
- Entering from a Driveway: When turning left onto a multi-lane roadway with a center turn lane, a driver may enter the center lane, stop, straighten the wheels, signal right, and wait for a safe gap in through traffic before merging.
4. Transverse Markings, Crosswalks & Bicycle Infrastructure
Transverse markings run across the roadway to manage pedestrian zones, stopping thresholds, and multi-modal integration.
+-----------------------------------------------------------------------------+
| TRANSVERSE MARKINGS & SPECIALIZED PAVEMENT |
| |
| [STOP BAR & CROSSWALK] [YIELD LINE (SHARK TEETH)] [BIKE LANE / SHARROW|
| |
| || || || ▲ ▲ ▲ ▲ ▲ | 🚴 | |
| || CROSSWALK || | | | | | | /\ | |
| || || || (Yield Threshold) | //\\ | |
| =============== | (Shared)| |
| [STOP BAR] |
+-----------------------------------------------------------------------------+
Specialized Markings Guide:
- Stop Bar (Stop Line): A thick solid white line (12 to 24 inches wide) extending across travel lanes. The front bumper of the vehicle must stop behind this line.
- Pedestrian Crosswalks: Marked by parallel white lines or high-visibility white ladder ("continental") blocks. Drivers must yield right-of-way to pedestrians within the crosswalk.
- Yield Lines ("Shark's Teeth"): A row of solid white triangles pointing toward approaching vehicles. Indicates the exact point where vehicles must yield at roundabouts and mid-block crossings.
- Dedicated Bike Lanes: Marked by a solid white line, a bicycle pictogram, and the words "BIKE LANE". Motorists must not drive in a bike lane except to make a turn at designated dashed lines, always yielding to cyclists.
- Shared-Lane Markings ("Sharrows"): A bicycle stencil with two chevrons indicating the travel lane is shared; cyclists are entitled to occupy the full lane center.
Test Your Knowledge
Under Michigan law (MCL 257.612), when is a motorist legally permitted to make a left turn on a steady red traffic signal?
A
B
C
D
Test Your Knowledge
What does a flashing yellow arrow traffic signal indicate to a driver intending to make a left turn at a signalized intersection?
A
B
C
D
Test Your Knowledge
If severe storm winds cause all traffic signal lights at a busy multi-lane intersection to go completely dark and inoperative, how must approaching drivers respond under Michigan law (MCL 257.649(4))?
A
B
C
D
Test Your Knowledge
What is the proper and legal use of a center two-way left-turn lane (marked by solid outer and dashed inner yellow lines) on a multi-lane roadway?
A
B
C
D