A yellow arrow at a traffic light means one of two things depending on whether it is steady or flashing. A steady yellow arrow warns that your protected turn is ending and you should prepare to stop. A flashing yellow arrow lets you make the turn, but only after yielding to oncoming traffic and any pedestrians in the crosswalk. Confusing the two is one of the quickest ways to cause a left-turn collision.
Steady Yellow Arrow
A steady yellow arrow tells you the green arrow you were following is about to disappear. Your protected turn phase is ending, and the signal will shift to either a red arrow or a red light. If you have not yet entered the intersection, stop before the stop line as long as you can do so safely at your current speed. If you are already in the intersection when the arrow turns yellow, finish the turn and clear out.1Federal Highway Administration. Manual on Uniform Traffic Control Devices 2009 Edition Chapter 4D – Section 4D.04 Meaning of Vehicular Signal Indications
The steady yellow lasts between 3 and 6 seconds, with longer durations used on higher-speed approaches.2Federal Highway Administration. Manual on Uniform Traffic Control Devices 11th Edition That is a short window, and it is not an invitation to accelerate. Its only purpose is to tell you the right-of-way is about to end.3Federal Highway Administration. Manual on Uniform Traffic Control Devices 2009 Edition Chapter 4D – Section 4D.26 Yellow Change and Red Clearance Intervals
Drivers sometimes hit what traffic engineers call the dilemma zone. You are close enough that stopping feels abrupt, but far enough back that you are not sure you will clear the intersection before red. At moderate speed with the arrow just appearing, you almost certainly have time to stop. If the arrow catches you a car length from the stop line, go through. The worst choice is the indecisive one, where you brake halfway and then accelerate again.
Flashing Yellow Arrow
A flashing yellow arrow gives you permission to turn, but not the right-of-way. You can go only after yielding to oncoming vehicles and any pedestrians in the crosswalk. Oncoming traffic has a green light during this phase and is not stopping for you.4Federal Highway Administration. Interim Approval for Optional Use of Flashing Yellow Arrow for Permissive Left Turns IA-10
Treat it as a “turn if you can” signal. Wait for a gap in opposing traffic large enough to complete the turn without forcing anyone to brake. If the gap is not there, you wait. A driver behind you leaning on the horn does not change that. Pedestrians crossing the street you are turning onto also have priority, and you have to let them clear before you move.
Most flashing yellow arrows control left turns, but the same signal is used for right turns at some intersections. The meaning is identical: you may turn, but only after yielding to conflicting traffic and pedestrians.5Federal Highway Administration. MUTCD 11th Edition Highlights – Section 4F.11
What Comes Next in the Cycle
Yellow arrows sit inside a predictable sequence, and knowing the order helps you anticipate the next change.
In a dedicated protected turn, the signal runs green arrow, then steady yellow arrow, then red arrow. The green gives you a fully protected turn with opposing traffic stopped. The steady yellow warns protection is ending. The red stops the turn.
In a permissive-only lane, the sequence is flashing yellow arrow, then steady yellow arrow, then red arrow. The flashing phase lets you turn when gaps allow, and the steady yellow warns the permissive window is closing.6Federal Highway Administration. Manual on Uniform Traffic Control Devices 2009 Edition Chapter 4D – Section 4D.18
Many intersections combine the two. You might see a green arrow first, then a steady yellow, then a flashing yellow for the permissive phase, then another steady yellow before red.7Federal Highway Administration. MUTCD 11th Edition Highlights – Section 4F.08 The one rule that holds across all of these: a steady yellow arrow always comes before red when the turn movement is being shut down. It never jumps straight from flashing yellow to red.
Red Arrow Versus Circular Red
After the steady yellow, you face either a red arrow or a circular red. The difference matters.
A steady red arrow means you cannot make the turn the arrow points to. You stop and wait for a green arrow or flashing yellow arrow. In most jurisdictions, turning on a red arrow is illegal unless a sign at that intersection specifically permits it.1Federal Highway Administration. Manual on Uniform Traffic Control Devices 2009 Edition Chapter 4D – Section 4D.04 Meaning of Vehicular Signal Indications
A circular red light generally allows a right turn on red after stopping and yielding, unless a sign prohibits it. In most places, a left turn on a circular red is also legal when going from one one-way street onto another. A red arrow removes those options; that is its whole purpose.1Federal Highway Administration. Manual on Uniform Traffic Control Devices 2009 Edition Chapter 4D – Section 4D.04 Meaning of Vehicular Signal Indications
Mistakes That Cause Tickets and Crashes
The most dangerous error is treating a flashing yellow arrow like a green arrow. A flashing yellow gives you permission, not priority. Pull into oncoming traffic without yielding and you will almost certainly be found at fault in the crash, because the opposing driver had a green light and the legal right-of-way.
The second common mistake is racing a steady yellow arrow. Drivers see the yellow and accelerate to make it, the same habit that plagues circular yellow lights. A steady yellow arrow lasts 3 to 6 seconds, which is enough time to stop from normal intersection speeds if you have not already crossed the stop line. Entering the intersection after the signal has turned red is a moving violation in every state, and it puts you in the path of cross-traffic about to get a green.
A subtler mistake is assuming a red arrow works like a circular red. Drivers used to turning right on red sometimes do the same on a red arrow and get ticketed. Unless a sign at that intersection expressly allows the turn, a red arrow means no turn at all.
Penalties for signal violations vary by state, but base fines for running a red light or failing to yield at a signal generally range from $25 to several hundred dollars, often with points added to your driving record. Surcharges and court fees in many states push the total well above the base fine.