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Intersection signals and turn lanes tell drivers which movement is allowed, when to yield, and which lane is open. In the United States, the Federal Highway Administration’s current reference is the 11th Edition of the Manual on Uniform Traffic Control Devices (MUTCD), with Revision 1 incorporated. Read the indication that governs your lane and movement, then follow the signs and pavement markings at that intersection; a signal for one lane or turn does not automatically govern every other lane.
What should I check before entering a turn lane?
First, identify the lane you are in and the movement its signs and pavement arrows permit. Then find the signal indication that applies to that lane and movement. A painted turn arrow or turn-only sign helps identify where the lane leads, but it does not replace the signal controlling the turn. Likewise, a signal arrow governs the direction it points; it is not permission to travel in another direction.
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As you approach, look for lane-use signs, pavement arrows, and any overhead lane-control signals before committing to a lane. Signal displays and intersection layouts differ, so do not assume that an arrow positioned over one lane applies to an adjacent lane, or that every turn lane has its own signal head. If signs or markings clarify which lane to use, follow them. The MUTCD includes optional signs such as “USE LANE(S) WITH GREEN ARROW” and “LEFT (RIGHT) ON GREEN ARROW ONLY” for situations where the lane-to-signal relationship needs clarification.
At the stop line, read the indication for your movement rather than guessing from the color or position of another signal head. Watch for pedestrians and conflicting traffic whenever your turn is permissive. An intersection can show different indications for different movements at the same time.
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What does each traffic signal indication mean?
The central distinction is whether an indication permits a protected movement or permits a turn only after yielding. A green arrow gives permission for the direction shown, while a flashing yellow arrow and a circular green allow a turn only when it is safe to proceed after yielding where required.
| Signal indication | What it controls | Driver action | Yielding and movement type |
|---|---|---|---|
| Green arrow | The movement in the arrow’s direction | Proceed in that direction, subject to lane layout, signs, and markings. | Protected movement; it does not authorize a different direction. |
| Flashing yellow arrow | The turn shown | Turn only after yielding and finding a safe gap. | Permissive; yield to opposing through traffic and pedestrians. |
| Steady yellow arrow | The movement whose green or flashing-arrow indication is ending | Recognize that the related movement is ending; the rules for that movement continue to apply while yellow is displayed. | It is not a new permission to start a different movement. |
| Red arrow | The movement in the arrow’s direction | Do not enter the intersection to make that movement unless another traffic-control device specifically permits it after stopping. | The indicated movement is barred unless a specific device provides an exception. |
| Circular green | Movements permitted by the lane layout and other controls | Proceed only where allowed; make a turn only when clear and after yielding where required. | A turn is permissive and requires yielding to pedestrians and/or opposing traffic. |
| Circular red | Movements facing the red signal | Stop. A turn after stopping may be allowed where applicable rules permit it, unless a sign or other device prohibits it. | Check for restrictions and pedestrians before any permitted turn. |
The MUTCD is the federal reference for traffic-control devices, but actual signal combinations and applicable turn rules depend on the intersection and jurisdiction. Follow the indication governing your movement, any posted restrictions, and local rules. Do not infer a signal sequence or an exception simply because another intersection uses one.
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A green arrow permits traffic in the direction the arrow points. It is a protected movement, not a general green light for every direction from that signal face. If the arrow points left, it does not authorize going straight or turning right from the same signal.
Before moving, confirm that your lane is the lane assigned to that arrow. A green arrow may be displayed for one movement while another lane has a different signal or restriction. Follow lane markings and signs, and do not cross from a lane that is not designated for your movement simply because you see a green arrow nearby.
Protected describes the signal operation for that movement; it does not mean a driver should ignore people or the actual roadway. Check the path ahead and proceed only in the direction shown. If a sign or marking conflicts with what you think the arrow means, stop and reassess rather than assuming the arrow applies to the entire approach.
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What does a flashing yellow arrow mean?
A flashing yellow arrow means the indicated turn is permitted only after yielding to opposing through traffic and pedestrians. It is a permissive turn, not a protected one. The FHWA’s MUTCD explanatory material puts it plainly: “The flashing yellow arrow is illuminated when traffic can safely turn by yielding to opposing through traffic and/or pedestrians (permissive operation).”
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Stop if necessary to let conflicting traffic or pedestrians clear, then turn only when there is a safe gap. A flashing yellow arrow does not mean opposing traffic has stopped, and it does not give you priority over people crossing. If you cannot complete the turn safely, wait rather than treating the flashing indication as a countdown or a command to go.
Do not assume that the signal for opposing traffic is changing just because your indication changes. A driver turning left may see a yellow indication and mistakenly suppose opposing traffic also has yellow. The FHWA Traffic Signal Timing Manual describes this as the “yellow trap.” Your safe response is to obey your own signal and yield as required, not to guess what another approach sees.
How is a flashing yellow arrow different from a green arrow?
A green arrow permits the protected movement shown; a flashing yellow arrow permits the turn only after yielding. The arrows may both point in the same direction, but their colors and flashing state convey different obligations.
With a green arrow, proceed in the arrow’s direction when your lane and the intersection allow it. With a flashing yellow arrow, first account for opposing through traffic and pedestrians, and wait for a safe opening. Neither indication authorizes a movement in a different direction from the arrow. The MUTCD and FHWA’s explanatory material on flashing-yellow-arrow operation distinguish these protected and permissive operations.
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What does a red arrow mean, and can I turn on a circular red?
A steady red arrow means do not enter the intersection to make the movement shown, unless another traffic-control device specifically permits that turn after stopping. A circular red means stop; a turn after stopping may be allowed by applicable rules, but a sign or other device can prohibit it.
Do not treat a red arrow as interchangeable with a circular red. The arrow identifies a movement that is barred while the indication is red; the MUTCD allows for a specific traffic-control device to authorize a turn after stopping. Look for that device and follow it, rather than assuming that the rules for a circular red apply to a red arrow.
Where a turn after stopping is allowed, stop first and check for restrictions, pedestrians, and conflicting traffic before proceeding. Rules can vary by jurisdiction and intersection. A clear roadway alone does not override a “No Turn on Red” sign or a red-arrow restriction.
What does a yellow arrow mean?
A steady yellow arrow indicates that the related green-arrow or flashing-arrow movement is ending. The MUTCD says the rules for the movement being terminated continue to apply while yellow is displayed.
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What do the arrows and X symbols over a lane mean?
Overhead lane-use signals control the lane below them. They are not turn arrows. A downward green arrow means the lane is open; a yellow X means prepare to leave the lane safely because it is changing to a red X; and a red X means the lane is closed.
| Overhead lane symbol | Meaning | Driver response |
|---|---|---|
| Downward green arrow | The lane below the signal is open to traffic. | Use the lane only for a movement allowed by its markings and signs. |
| Yellow X | The lane is about to close and is changing to a red X. | Prepare to vacate the lane in a reasonably safe manner. |
| Red X | The lane is closed. | Do not use the lane. |
| White two-way left-turn arrow | The lane may be used for left turns by traffic from both directions. | Use it for left turns, not through travel, and follow its markings and signs. |
Match the overhead signal to the lane directly beneath it. A green downward arrow does not by itself say that the lane is a turn lane; lane markings and signs establish its use. Similarly, a turn arrow at an intersection controls a direction of travel, not the open-or-closed status of a lane along the approach. The MUTCD’s lane-use signal provisions and associated signs make this distinction explicit.
Which lane should I use to turn?
Use the lane identified by its signs and pavement markings for the turn, then obey the signal that controls that lane and movement. Do not choose a lane based only on the location of a signal head or the direction you intend to travel.
- Read lane-use signs early. Look for turn-only or lane-assignment signs as you approach, before changing lanes or reaching the intersection.
- Check the pavement arrows. A lane arrow indicates the movement or movements assigned to that lane. If markings and signs show the lane is turn-only, do not use it to travel straight.
- Match the signal to the lane. Identify the signal face or overhead indication that governs the lane you are using. Signs such as “USE LANE(S) WITH GREEN ARROW” may clarify which lanes correspond to an arrow.
- Read the signal indication, not just its color. A green arrow permits the direction shown; a flashing yellow arrow permits a turn after yielding; a red arrow bars its indicated movement unless a specific device allows it after stopping.
- Yield when the movement is permissive. With a flashing yellow arrow or a circular green turn, check for opposing traffic and pedestrians and wait for a safe gap.
If an arrow appears to apply to a neighboring lane, do not guess. Follow signs and markings at that location and the signal governing your lane. If you are already in a lane that does not permit your intended movement, do not make a sudden or unsafe lane change to follow an arrow.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why shouldn’t I guess what opposing traffic sees?
Signal indications for opposing approaches do not necessarily change together, and assuming they do can put a turning driver in conflict with through traffic. The FHWA Traffic Signal Timing Manual describes a “yellow trap”: a left-turn driver sees yellow and incorrectly assumes opposing traffic has also received yellow, then turns without checking for a safe gap.
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Agencies can use signal phasing and display choices, including flashing yellow arrows, to address operational issues, but drivers still must follow their own indication and yield where required. In practical terms, look at the actual traffic conflict. Do not base a turn on a belief that opposing drivers have a red or yellow signal, and do not treat a change on your signal as proof of what another approach sees. See the FHWA’s Traffic Signal Timing Manual, Chapter 4 for its discussion of signal timing and the yellow trap.
How do I avoid confusing turn arrows and lane arrows?
Ask what the signal controls: a direction of movement or the lane itself. A turn arrow points to the movement it permits or restricts. An overhead lane-use symbol applies to the lane beneath it and indicates whether that lane is open, closing, or closed.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteFor example, a green left arrow at an intersection authorizes the left-turn movement shown, not through travel from that signal face. A downward green lane arrow above an approach lane means that lane is open to traffic; its permitted direction still depends on signs and pavement markings. A yellow X above a lane is a warning to prepare to vacate safely, not an instruction to turn left. A red X means the lane is closed, even if another signal nearby shows green for a different movement.
When more than one kind of signal appears, read each one according to what it governs. The turn signal, the lane-use signal, lane markings, and signs can all provide separate pieces of information. The safest interpretation is the one that matches your lane, your intended movement, and the controls explicitly associated with them.
Frequently Asked Questions
Does a green arrow mean I can turn in the opposite direction too?
No. An arrow authorizes only the movement in the direction it points. Use a separate signal or other control to determine whether another movement from your lane is allowed.
Can I turn while a flashing yellow arrow is on if no cars are visible?
Only when the turn can be made safely after yielding to opposing traffic and pedestrians. Keep checking for pedestrians and traffic that may be approaching or crossing; the flashing indication does not make the turn protected.
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Do not make a sudden lane change or cut across another lane at the intersection. Continue in a lane whose signs, markings, and signal permit the movement, then choose a safe, lawful route to correct your direction.
Does a downward green arrow over a lane mean that lane is for turning?
It means the lane beneath the signal is open, not that it is necessarily a turn lane. Check the lane’s pavement markings and signs to determine which movements are allowed there.
