4.3 Traffic Signals, Lane Arrows & Pavement Markings
Key Takeaways
- Traffic light indications mandate specific actions: Solid Red requires a full stop; Flashing Red requires treating the intersection as a Stop sign; Flashing Yellow requires slowing down and proceeding with caution.
- A Flashing Yellow Arrow allows left turns only after yielding the right-of-way to all oncoming vehicles and crossing pedestrians; Solid Green Arrows grant a protected turn where oncoming traffic is stopped.
- White pavement lines separate traffic moving in the SAME direction (broken = lane changes allowed; solid = lane changes discouraged; double solid = lane changes prohibited).
- Yellow pavement lines separate traffic moving in OPPOSITE directions (broken = passing permitted; solid on your side = no passing; double solid = no passing in either direction).
- Shared Two-Way Left-Turn Lanes (TWLTL) are bounded by outer solid and inner dashed yellow lines and must be used EXCLUSIVELY for making left turns into or out of driveways—never for passing or through travel.
4.3 Traffic Signals, Lane Arrows & Pavement Markings
Quick Answer: Traffic signals and pavement markings manage intersection right-of-way and roadway lane organization. A Flashing Red light functions exactly like a Stop sign (full stop required), while a Flashing Yellow light requires you to proceed with caution. A Flashing Yellow Arrow allows left turns after yielding to oncoming traffic and pedestrians; a Solid Green Arrow grants a protected turn. On the pavement: White lines separate traffic in the same direction (broken = changing lanes allowed, solid = discouraged, double solid = prohibited); Yellow lines separate traffic in opposite directions (broken = passing allowed, solid on your side = no passing, double solid = no passing either way). A shared two-way left-turn center lane is used only for left turns, never for driving through or passing.
Under Minnesota Statutes Chapter 169 (Traffic Regulations), drivers must obey all traffic control signals, lane arrows, and pavement markings. Understanding these control devices ensures orderly traffic movement, prevents head-on crashes, and protects non-motorized road users.
1. Circular Traffic Signals and Flashing Indications
Traffic signals govern traffic flow at intersections by alternating right-of-way among conflicting movements.
| Signal Indication | Mandatory Legal Action | Key Safety Considerations |
|---|---|---|
| Solid Red | Complete stop at stop line or crosswalk | Right turn on red is permitted after a complete stop unless 'No Turn on Red' is posted. Left turn on red is permitted ONLY when turning from a one-way street onto another one-way street. |
| Solid Yellow | Clearance interval; signal changing to red | Stop before the intersection if safe to do so. If already in the intersection or unable to stop safely, proceed through with caution. Do not accelerate to beat the light. |
| Solid Green | Proceed straight or turn right/left | Yield to oncoming vehicles and pedestrians when making an unprotected left turn. Do not block the intersection if traffic is backed up. |
| Flashing Red | Treat as a Stop Sign | Come to a complete stop. Yield to cross-traffic and pedestrians. Proceed only when the intersection is clear. |
| Flashing Yellow | Proceed with Caution | Slow down, scan for cross-traffic and pedestrians, and proceed through without coming to a full stop unless necessary. |
+-----------------------------------------------------------------------------+
| FLASHING TRAFFIC SIGNALS COMPARISON |
| |
| [ FLASHING RED ] ======> TREAT AS STOP SIGN (Complete stop mandatory) |
| [ FLASHING YELLOW ] ======> PROCEED WITH CAUTION (Slow down, scan, proceed)|
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2. Lane Arrows & The Flashing Yellow Arrow (FYA)
Arrow signals provide movement-specific instructions for dedicated turning lanes:
Modern Arrow Indications
- Solid Green Arrow (Protected Turn): Approaching oncoming traffic is held by a red light. You have the right-of-way to make the indicated turn, though you must still yield to pedestrians lawfully in the crosswalk.
- Solid Yellow Arrow (Clearance Interval): The protected turning phase is ending. Prepare to stop or complete your turn if already committed to the intersection.
- Solid Red Arrow (Turn Prohibited): Drivers in the dedicated turn lane must remain stopped. Turning in the direction of a red arrow is strictly illegal.
- Flashing Yellow Arrow (FYA - Unprotected Permissive Turn): Under modern Minnesota traffic engineering standards, a flashing yellow arrow indicates that turns are permitted, but unprotected. You must yield the right-of-way to oncoming traffic and pedestrians in the crosswalk before turning.
+-----------------------------------------------------------------------------+
| ARROW SIGNAL MEANINGS & ACTIONS |
| |
| [ GREEN ARROW ] ======> PROTECTED TURN (Oncoming traffic stopped) |
| [ FLASHING YELLOW ARROW ] UNPROTECTED TURN (Must YIELD to oncoming cars)|
| [ RED ARROW ] ======> MANDATORY STOP (Turn strictly prohibited) |
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3. Freeway Ramp Meters
Ramp meters are electronic traffic signals located on freeway entrance ramps. They are activated during morning and evening rush hours to regulate the flow of vehicles merging onto congested urban freeways.
- One Car Per Green: Ramp meters typically cycle rapidly between red and green. Drivers must pull up to the stop line and proceed one vehicle per green light per lane.
- Carpool / Transit Bypass: Many metered ramps feature an adjacent dedicated bypass lane for buses, registered carpools, and motorcycles.
4. Longitudinal Pavement Markings: Colors & Line Types
Pavement markings provide continuous guidance regarding lane boundaries, passing zones, and road edges.
Line Color Principles
- White Lines: Separate traffic lanes moving in the SAME direction, and mark the right shoulder (fog line) of the roadway.
- Yellow Lines: Separate traffic lanes moving in OPPOSITE directions, and mark the left shoulder on divided highways and one-way roadways.
Line Patterns & Legal Meanings
| Marking Pattern | Color | Traffic Direction | Legal Meaning & Maneuver Permitted |
|---|---|---|---|
| Broken (Dashed) Line | White | Same Direction | Lane changing is permitted with proper signaling and safe spacing. |
| Solid Line | White | Same Direction | Lane changing is discouraged; used near intersections, turn lanes, and exit approaches. Also marks the right fog line. |
| Double Solid Lines | White | Same Direction | Lane changing is strictly prohibited; used to buffer high-occupancy vehicle (HOV) / E-ZPass express lanes. |
| Broken (Dashed) Line | Yellow | Opposite Directions | Passing is permitted in either direction when oncoming traffic is clear. |
| Solid Yellow + Broken Yellow | Yellow | Opposite Directions | Passing is permitted for traffic on the side with the broken line, but prohibited for traffic on the side with the solid line. |
| Double Solid Lines | Yellow | Opposite Directions | Passing is strictly prohibited in both directions. Drivers may cross double yellow lines only to make a left turn into a driveway or side street. |
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| PAVEMENT LINE MARKING COMBINATIONS |
| |
| [ ---------------- ] Broken White ... Lane changes permitted (same dir) |
| [ ════════════════ ] Solid White .... Lane changes discouraged |
| [ ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ ] Double Solid White .. Lane change strictly ILLEGAL |
| |
| [ - - - - - - - - ] Broken Yellow .. Passing permitted (opposing lanes) |
| [ ════════════════ ] |
| [ - - - - - - - - ] Solid + Broken . Passing ONLY on broken side |
| [ ════════════════ ] |
| [ ════════════════ ] Double Solid ... Passing PROHIBITED in both dirs |
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5. Specialized Lane Markings & Controls
Shared Two-Way Left-Turn Center Lanes (TWLTL)
A shared two-way left-turn lane is a central lane positioned between opposing traffic flows, marked on each side by an outer solid yellow line and an inner dashed yellow line with painted opposing left-turn arrows.
- Lawful Purpose: Used exclusively for making left turns into or out of side streets, driveways, and business parking lots.
- Prohibited Conduct: You must never use a center turn lane as a regular driving lane, for through travel, or to accelerate when merging into traffic. You must never use a TWLTL to pass other vehicles.
+-----------------------------------------------------------------------------+
| SHARED TWO-WAY LEFT-TURN CENTER LANE |
| |
| ================== (Solid Yellow Outer Boundary) |
| - - - - - - - - - - (Dashed Yellow Inner Boundary) |
| <-- |
| --> (Opposing Curved Left Turn Arrows) |
| - - - - - - - - - - (Dashed Yellow Inner Boundary) |
| ================== (Solid Yellow Outer Boundary) |
| |
| • Purpose: LEFT TURNS ONLY. |
| • Prohibited: Through driving, merging acceleration, passing. |
+-----------------------------------------------------------------------------+
Reversible Lanes
Reversible lanes are designed to accommodate peak-hour directional traffic on multi-lane urban arterials and bridges. Overhead lane-use control signals dictate lane availability:
- Steady Green Downward Arrow: You may drive in the lane.
- Steady Yellow 'X': The lane is closing to your direction; safely vacate the lane.
- Flashing Yellow 'X' or Arrow: The lane may be used only for making a left turn.
- Steady Red 'X': The lane is open to oncoming traffic; driving in this lane is strictly illegal.
High-Occupancy Vehicle (HOV) & E-ZPass Lanes
Marked by a large white diamond symbol painted on the pavement and overhead signs. In Minnesota (such as on I-394, I-35W, and I-35E), these lanes are reserved during designated peak hours for buses, motorcycles, vehicles with two or more occupants, or single-occupant vehicles equipped with an active E-ZPass electronic toll transponder.
Transverse Markings: Stop Lines, Crosswalks & Rail Symbols
- Stop Lines: Wide, solid white transverse lines across a lane indicating the exact point where a vehicle must stop behind an intersection, stop sign, or red light.
- Crosswalk Markings: Solid white parallel lines or high-visibility "Continental" white zebra stripes across the roadway. Motorists must yield to pedestrians occupying any portion of the crosswalk.
- Railroad Pavement Markings: A large white "X" flanked by the letters "R R" painted on the pavement in advance of a railroad grade crossing, accompanied by a white transverse stop line.
A motorist is driving on a four-lane city arterial with a center shared two-way left-turn lane marked by outer solid yellow lines and inner dashed yellow lines. Which of the following maneuvers is legal in this lane?
At a signalized intersection in Minnesota, an overhead traffic light displays a Flashing Yellow Arrow for the left-turn lane. What does this signal require the driver to do?
While driving on a multi-lane highway, you encounter double solid white lines separating your travel lane from an adjacent express lane. What do double solid white lines mean?