Traffic signals: what each light and arrow actually requires
11 October 2026 · 6 min read
Signal questions look easy and quietly collect marks, because the rules attach to shapes and flashes as much as to colour. Here is the complete set, in the order a driver meets them.
Steady lights
- Steady red: stop before the stop line or crosswalk. Unless a sign forbids it, a right turn on red is usually permitted after a full stop and after yielding to traffic and pedestrians. Some states also allow a left turn on red from a one-way street onto a one-way street; that is a state detail worth checking rather than assuming.
- Steady yellow: the signal is about to change. Stop if you can do so safely; do not accelerate to beat it. The legal phrasing usually includes both halves, and questions test the second half more often.
- Steady green: you may go, and you still have duties. You yield to vehicles and pedestrians already lawfully in the intersection, and when you turn left on a green you yield to oncoming traffic.
Arrows
A green arrow is a protected movement: oncoming traffic is stopped, so you turn without yielding to it, and still yield to pedestrians in your path. A yellow arrow means the protected phase is ending, and a flashing yellow arrow means you may turn but you must yield to oncoming traffic. That last one is the arrow people misread, because a flashing yellow anywhere else means caution without stopping, while a flashing yellow arrow carries the yielding duty with it.
A red arrow forbids that movement while it is showing. You do not turn right on a red arrow unless a sign or signal specifically permits it.
Flashing modes
Flashing red behaves like a stop sign: stop, then proceed when it is safe, and at an intersection where several approaches flash red, treat it as a four-way stop with the usual yielding order.
Flashing yellow on a round or main signal means proceed with caution. You are not required to stop, and you do have to look, because the flash usually means the signal is not controlling the flow normally.
When the signal is dark or broken
A completely dark traffic signal is treated as a four-way stop in most states, with the same rules about who arrives first and who yields to whom. The exam question usually shows a power failure with cars on all four approaches, and the answer hinges on taking turns rather than on who has the "right" to go first.
Pedestrian signals
A walking figure means pedestrians may start crossing. A flashing hand means they should not start but should finish, and a steady hand means they should not be in the crosswalk. For a driver, the practical rule is that the pedestrian signal is about pedestrians, and its state never gives you permission to drive into a crosswalk occupied by a person.
Some intersections have a leading pedestrian interval, where the walk symbol appears a few seconds before your green. That means pedestrians get a head start, and your turn must wait for them.
The "yellow trap" and other collisions of rules
If you are waiting in the middle of an intersection to turn left and the light turns yellow, you should complete your turn when it is safe, because you are already lawfully in the intersection. What you should not do is enter an intersection on yellow when you have no space to clear it; blocking the crossing is its own violation and shows up in questions about box junctions.
How to study signals
Group them by the action they demand, not by colour: stop, yield-and-go, go-with-duties. Then, for each flash and arrow, say the duty out loud. A question about a flashing yellow arrow is really asking "do you know who yields here", and once you answer that question, the option becomes obvious.
RoadCite is an independent study tool and is not affiliated with any DMV or government agency. Turn-on-red rules and a few arrow conventions vary by state; confirm with your own handbook.