🎓 Prepared by students from Boğaziçi University

What Do Traffic Light Colors Mean?

Traffic light sequences show drivers when to stop, prepare and proceed. Red means stop absolutely. Yellow means prepare to stop. Green means proceed if the intersection is safe. Understanding light sequences is essential for safe, legal driving.

Short answer

Traffic light colors are: red (stop), yellow/amber (prepare to stop), and green (proceed). Sequences vary by intersection; always watch for turning traffic and oncoming vehicles.

Standard Traffic Light Sequence Timeline
11100
x: Time (seconds) · y: Light StateRedYellowGreenYellow
01

Step-by-step worked examples

A red light is showing, but there are no vehicles approaching. Can you proceed?

No, you must not cross even if no traffic is coming.
Red light is absolute: stop and wait.
Result: You must stop and wait for green.

The light turns yellow as you approach the intersection. What should you do?

Assess your distance and speed: can you stop safely before the line?
If yes, stop. If no, and you're too close, proceed cautiously.
Result: Yellow means 'prepare to stop', not 'speed up'.

Green light is showing, but a car is turning across your path. What happens?

Even with green, you must yield to turning traffic if it has the right of way.
Always check for cross-traffic before entering.
Result: Proceed only when the intersection is clear.
02

Flashcards

03

Quick quiz

Q1.A red light is showing, but the intersection looks empty. Do you proceed?

Correct answer: B. Red light is absolute. You must stop and wait, even if no traffic is visible.

Q2.Yellow light at a distance. You're traveling 40 km/h. Can you cross safely?

Correct answer: B. Yellow means 'prepare to stop'. Judge your distance and speed; stop if safe to do so.

Q3.Green light, but a car is turning across your path. Proceed or wait?

Correct answer: B. Even with green, you must yield to traffic with right of way. Check and proceed only when safe.

Q4.You enter an intersection on green. The light turns red while you're in it. Is this legal?

Correct answer: B. If you entered legally on green, it's legal to be in the intersection when it turns red. Clear it promptly.
📄Download this topic as a printable worksheet (PDF)Summary + 10 questions + answer key — print it, share it in class.
Study better with Bounlu apps
Notek
Notek

The full card deck, worked steps and AI-tutor support for “What Do Traffic Light Colors Mean?” are in Notek — study by hand before your exam.

Get it free
Notek 1Notek 2Notek 3Notek 4Notek 5
04

Common mistakes

Yellow light means you should speed up to cross before red.Correct: Yellow means prepare to stop. Slow down and stop if possible.

If no traffic is coming, red light doesn't apply to you.Correct: Red is absolute. Always stop, regardless of whether traffic is visible.

Green light means you can always proceed.Correct: Green means proceed IF the intersection is clear and safe.

You can proceed on yellow if you're close to the line.Correct: Proceed on yellow only if you cannot stop safely. Otherwise, stop.

05

FAQ

What do traffic light colors mean?

Red=stop, yellow=prepare to stop, green=proceed if safe. Each color has a specific meaning for driver safety.

What is a typical traffic light sequence?

Red (30s) → Yellow (3s) → Green (30s) → Yellow (3s) → Red. Times vary by intersection.

Can you cross on yellow?

Only if you cannot stop safely. If you can stop, you should. Yellow is not permission; it's a warning.

What if you're in an intersection when it turns red?

Continue and clear the intersection promptly. It's legal if you entered on green.

Related topics