Meaning J30
Warning: low-flying aircraft. This sign warns of a danger. Stay alert and adjust your speed and following distance.
Memory aid
J = pay attention. A triangle is a warning: look and slow down.
Common mistake
Common mistake: ignoring warnings and not adjusting your speed.
On the road
You are driving and see sign J30 (Warning: low-flying aircraft). This sign warns of a risk ahead.
What should you do?
- Slow down and stay extra alert.
- Increase your following distance.
- Prepare for the danger the sign names.
Practice questions with model answers
What does sign J30 mean?
Warning: low-flying aircraft. This sign warns of a danger. Stay alert and adjust your speed and following distance. In theory questions the point is the immediate effect: what should you do now?
What should you change as soon as you see this sign?
Slow down and stay extra alert. Increase your following distance. Prepare for the danger the sign names. This is exactly what the CBR tests.
How should you adjust your speed and following distance for this warning?
Lower your speed, increase the gap and stay alert to the named risk. The exam wants the answer that combines safety and anticipation.
Frequently asked questions
What does sign J30 mean?
Warning: low-flying aircraft. This sign warns of a danger. Stay alert and adjust your speed and following distance.
What should you do immediately at sign J30?
Slow down and stay extra alert. Increase your following distance. Prepare for the danger the sign names.
What is a common mistake with sign J30?
Common mistake: ignoring warnings and not adjusting your speed.
What else should you watch for with this sign?
Watch for supplementary plates, zone markings and any end signs.
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