DKTKey points on traffic lights for the South Australia learner test. Each answer is checked against the official South Australia handbook or road rules; use the practice-question links to test yourself.
The traffic lights ahead are dark (not working) and there are no other signs. How must you treat the intersection?
Answer: As an intersection with no signs or signals, giving way as usual
When lights are not operating (or only flash yellow), drivers give way as at an intersection without lights or signs, unless a stop sign applies.
Practice question 151 · official source
Your light is green, but traffic ahead is stopped past the intersection and there is no room on the far side for your vehicle. What must you do?
Answer: Wait before the intersection until there is room on the far side
A driver must not enter an intersection if they cannot drive through it because the intersection or the road beyond is blocked.
Practice question 152 · official source
You entered an intersection on green to turn right. The light turns red while you wait for a gap. What must you do?
Answer: Leave the intersection as soon as it is safe to do so
A driver who has entered an intersection when the lights change must leave it as soon as they safely can, still giving way to others as needed.
Practice question 153 · official source
There is no stop line at the traffic lights and the light is red. Where must you stop?
Answer: As close as practical to, but before, the traffic lights
If there is no stop line (or stop here on red sign), you must stop as near as practicable to, but before reaching, the nearest or only traffic lights.
Practice question 154 · official source
You want to go straight ahead through an intersection in busy traffic and the lights turn green. When may you enter it?
Answer: When there is room for your vehicle on the far side
You must not enter an intersection unless there is space for your vehicle in your lane on the far side, even on a green light.
Practice question 155 · official source
Your vehicle is already inside an intersection when the lights change to yellow. What should you do?
Answer: Clear the intersection as soon as it is safe
Once you have entered an intersection you must not stop in it. Leave as soon as it is safe to do so.
Practice question 156 · official source
What must you do when a red traffic light shows?
Answer: Stop at the stop line and wait for the green light
A red light means you must stop as close as possible behind the stop line, even if there is no other traffic.
Practice question 157 · official source
The traffic lights change from green to yellow as you approach. What should you do?
Answer: Stop, unless you are too close to stop safely
A yellow light means stop. You may only go through if you cannot stop safely before the stop line. Do not brake suddenly or speed up.
Practice question 158 · official source
You are approaching traffic lights when the amber light changes to red. What must you do?
Answer: Stop behind the stop line and wait for the green light
A red light means stop. Stop as near as practicable behind the stop line and stay stopped until the light shows green.
Practice question 159 · official source
The traffic lights facing you change to green. What should you do before driving into the intersection?
Answer: Check both sides and go only if the way is clear
Green means you may go only if it is safe. Check for vehicles and pedestrians still crossing before you move off.