Flashing Yellow Arrow, Two Conflicts at Once
Dry, clear evening at 6:40 p.m.; the sun is low but not in your eyes. You are in the left-turn lane of a four-lane arterial posted 45 mph, facing a flashing yellow left-turn arrow. A pickup is oncoming about 250 feet away, holding near the limit. On the cross street to your left, a pedestrian in dark clothing steps off the curb into the marked crosswalk. Your student, who has about 20 hours behind the wheel, says, "I've got an arrow, I'm going," and begins to release the brake. Your right foot is already hovering over the instructor brake.
1. What does the flashing yellow arrow actually permit, and what is your decision in this instant?
Read the worked answer
The arrow is permission, not protection. A flashing yellow arrow means the left turn is permitted after yielding - it does not assign right-of-way the way a green arrow does.
Two conflicts are live:
- Oncoming pickup. At 45 mph that vehicle covers about 66 feet per second, so 250 feet is roughly 3.8 seconds to your position. A left turn from a stop typically takes 4–6 seconds to clear the oncoming lane. That is already marginal, and marginal plus a 16-year-old's acceleration estimate is a no.
- Pedestrian in the crosswalk. She is stepping into the crosswalk on the street your student is turning into. The turn cannot be completed without crossing her path.
Action: hold the vehicle. Firm verbal "hold, hold" with the instructor brake covered, and let the student feel that you are serious before the car rolls. Then talk.
Debrief line to use: "Count the yields. A permitted left turn always has two - oncoming vehicles, and pedestrians or bikes in the crosswalk you're entering. The arrow tells you which turn you may make; it never tells you when."
2. How do you teach the student to read the signal and not the habit? Include the other left-turn displays.
Read the worked answer
Teach the concept of protected versus permitted, then attach displays to it.
| Display | Meaning | Yields required |
|---|---|---|
| Green arrow | Protected turn | None to oncoming traffic |
| Flashing yellow arrow | Permitted turn | Oncoming vehicles and pedestrians/bikes in the destination crosswalk |
| Steady yellow arrow | Clearance - stop if you can do so safely | Prepare to stop |
| Steady red arrow | Stop; no turn until a permitted display appears | - |
Method: take the same intersection at three different times of day so the student sees the display change with the same geometry. Have her say aloud, before moving, "protected or permitted? Who do I owe a yield to?" Habit dies when the student has to name the reason.
One caution to plant now: if she has already lawfully entered the intersection on a permitted or green display and the light turns red while she waits for a gap, she finishes the turn when it is clear. She does not reverse, and she does not freeze in the middle of the box.