Yellow traffic lights are a useful test of whether a learner plans ahead or reacts late. A driver should never treat yellow as an invitation to accelerate. The instructor’s role is to establish calm approach speeds, good following awareness and decisions that follow the actual South Australian rule.
Explain the legal decision accurately
A steady yellow light means the signal is about to change to red. The South Australian Driver’s Handbook says a driver must not enter the intersection unless so close to the stop line that stopping safely is not possible without entering the intersection or risking a rear-end collision from following traffic. This is a safety-based exception, not a general permission to race the signal.
The distinction matters: braking harshly without considering following vehicles can itself create risk, while entering simply to save time is not justified. The driver must assess the real situation when the signal changes. Instructors should not teach a universal distance or “always stop no matter what” slogan.
Train the decision before the light changes
Choose a suitable training area and coach the learner to release the accelerator and scan the intersection before arrival. Discuss the signal phase, following distance, available stopping space and the state of traffic beyond the intersection. Approach at a speed that allows a smooth stop if the light changes.
The learner should understand that a green signal does not authorise entering a blocked intersection. Likewise, a turning driver may still have give-way obligations after receiving a permitted signal.
Debrief the process, not simply the outcome
Ask: “When did you first recognise that the lights might change?” “Could you have stopped smoothly at the speed you were travelling?” “Did you know what was behind you?” Encourage specific answers based on what the learner observed.
A successful lesson does not require deliberately timing or provoking yellow-light situations. Use naturally occurring traffic-light approaches, parked-vehicle discussion or paused video reviewed in a safe off-road setting. Never distract the learner with a lengthy question at a complex intersection.
Common habits to correct
- Speeding up when approaching an older green signal.
- Focusing only on the traffic light, with no awareness of the queue or traffic behind.
- Hard braking because the learner believes yellow always means an immediate stop regardless of circumstances.
- Assuming the road ahead is clear because the light is green.
The aim is early hazard recognition and legal, controlled driving, rather than trying to predict a particular test examiner’s preferred moment.
Official references and further learning
- South Australian Driver’s Handbook: Traffic lights
- Australian Road Rules (SA authorised legislation)
Explore DAA car driving instructor training.
Road-law information checked against the linked South Australian Government sources on 16 October 2026. Educational commentary only; always check the currently authorised rules and the requirements applicable to a specific training or assessment program.