The School Zone at 8:20 am
It is 8:20 am on a weekday. You are driving east on a suburban WA street posted at 50 km/h. A school zone sign with a 40 km/h limit and a flashing light applies between 7:30 and 9:00 am and 2:30 and 4:00 pm on school days. Children are walking on the footpath and a crossing guard is standing at a marked children's crossing ahead, facing away from you and talking to a child. A car two vehicles ahead has stopped abruptly with its hazard lights on. Your lane is clear for about 40 m ahead. There is a solid centre line to your right and a parked car partly overhanging the left edge of your lane.
1. What is the applicable speed limit right now, and what speed should you actually be travelling at?
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The legal limit is 40 km/h, because the flashing light is active and the time (8:20 am) falls inside the posted school-zone period on a school day. The 50 km/h limit does not apply while the zone is in force.
The legal limit is not the target speed. With children on the footpath, a crossing guard occupied with a child, a stopped vehicle ahead with hazards on, and a parked car narrowing your lane, your safe speed is well below 40 km/h - perhaps 20–25 km/h, ready to stop. The presence of children near the kerb is the decisive factor: a child can step out without looking, and at 40 km/h you cover about 11 m per second.
You should also be prepared to stop for the crossing guard once they turn and raise the sign or enter the crossing. Reduce speed early rather than braking late.
2. The stopped car ahead has hazards on and there is a solid centre line. Can you cross it to pass, and what governs your decision?
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A solid centre line means you must not cross or straddle it to overtake. The exception is to pass a stationary obstacle, but only if it is safe and you do not cross into a lane of oncoming traffic in a way the markings prohibit. In a school zone with children present and limited sight distance, the safe course is to stop behind the vehicle rather than pass.
The decision is governed by three things:
- Markings and law - the solid line restricts you.
- Visibility - you cannot see far enough past the stopped car to know the lane ahead is clear, particularly with a parked car narrowing the left side.
- Vulnerable road users - children may be crossing in front of the stopped car, which is exactly why it stopped.
Wait, observe, and proceed only when the reason for the stop is clear and the way ahead is genuinely safe.