This regional Australian term describes an extremely fine, powdery red soil that accumulates on unsealed roads and tracks. It behaves almost like a liquid when disturbed, instantly blinding drivers with thick clouds and clogging engine air filters. Because it settles evenly over deep ruts and washouts, it creates a deceptive visual surface that can cause severe suspension damage or cause a heavy vehicle to bog down completely.
Heard on the job
Keep your speed down on the northern track, the bull dust is hiding some massive craters near the creek crossing.
Insider tip
Experienced outback drivers carry heavy-duty air filter blowers and maintain significant following distances to survive heavy dust zones.