Road Signs & Signals
⏱ ~3-min readAceMark Guide
What this topic is really about
A flashing green traffic light indicates an advanced left-turn phase where oncoming traffic is stopped, giving the driver the right-of-way to turn left, go straight, or turn right.. A flashing green light means you have the right-of-way to turn left, go straight, or turn right because oncoming traffic is being held by a red signal.
A flashing red signal obliges you to make a full stop and only proceed when it is safe, just like a stop sign.. A flashing red signal is treated exactly like a stop sign: you must come to a full stop and yield to other traffic and pedestrians before proceeding.
See the mechanism
The flashing green light is a specific type of signal that provides a protected window for left-turning drivers, allowing them to proceed without conflict from oncoming traffic. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.
An exam-style question, fully explained
You see a flashing green traffic light at an intersection in Ontario. What does it indicate?
- Identify what the question tests: You see a flashing green traffic light at an intersection in Ontario..
- A flashing green light means you have the right-of-way to turn left, go straight, or turn right because oncoming traffic is being held by a red signal.
- This advanced phase gives left-turning drivers a protected window.
- It should not be confused with a flashing red, which means stop, or a yield situation.
- Why it matters: The flashing green light is a specific type of signal that provides a protected window for left-turning drivers, allowing them to proceed without conflict from oncoming traffic. This is distinct from a yield situation or a broken signal, which would require caution or a different response. The key benefit of a flashing green light is that it provides a clear indication of when it is safe to turn left, reducing the risk of accidents.
Traps the examiner sets
- Some drivers may confuse a flashing green light with a flashing red light, which requires a stop, or with a yield sign, which requires caution and a yield to oncoming traffic. It is essential to understand the specific meaning of a flashing green light to navigate intersections safely.
- People often mistake a flashing red for a green light or think they can proceed slowly without stopping, confusing it with the flashing amber signal.
Test your recall
Answer each from memory — you'll see instantly whether you're right and why.
Run a focused 10-question mini-mock on Road Signs & Signals and see it stick.
Practice more of this topic →