Bulldust

"Bulldust" or "bull dust" is a fine, soft and powdery red aeolian dust which is common across Australia, especially in the Outback.and desert. Bull dust is a type of fugitive dust. Bull dust is common on remote roads, especially in the far north of Australia where the wet and dry season can cause the roads to either be boggy or very dry. Bull dust, is also an Australian colloquial term. 
Causes and General Description.
Bull dust is a very fine dust that is formed from when a road surface is disturbed and breaks up into very small particles which are suspended in the air. This can occur in dry areas, such as the Outback or when there has been an extended dry season . These disturbances can be anything that breaks up the track surface such as a car or vehicle driving along a road to a pack of animals running through the desert, such as camels 
Bull dust can be identified when driving by the softness of the road, it is visually similar to that of soft sand. From a distance, bull dust may appeared to be settled but once disturbed it billows up to form a dust cloud. The road has noticeable soft bumps and slumps caused by tyre tracks, the road surface resembles soft waves running across the roads, which are caused by wheel ruts which have left depressions in the sand-like surface 
Bull dust can range in intensity, from shallow slumps which range between a few centimetres deep with soft dusty edges. Bull dust can be more dangerous with slumps ranging over 30 centimetres, and a rock-hard edge .
Effects.
Bull dust can be problematic for people who drive through it and can cause health problems such as coughing and sneezing, and also poses a threat to people with respiratory illnesses but also can damage a car and a person’s ability to drive. In extreme cases, a temporary loss of vision can cause car accidents such as a roll-over, or can cause someone to hit vegetation or an animal such as a kangaroo which can signifiantly damage a car, and kill the animal. A bull dust hole can also significantly damage a car if not taking the necessary precautions. . 
Driving.
When driving, bull dust billows up into a cloud behind a car and can have a range of effects on a car and a person’s ability to drive, depending on the intensity of the dust. As bull dust is a fine and powdery substance, it can cause difficulties in keeping control of the vehicle and can cause skidding which can lead to accidents. The fine dust can also damage a car’s engine, especially through the engine’s air intake system . Moreover, a cloud of bull dust can conceal road hazards and impair a driver’s vision. These road hazards can include, but are not limited to, potholes, other vehicles, animals, trees and other fauna. . The proceeding effects of driving through bull dust can be a burst tyre, getting bogged, a bent rim or suspension damage . Furthermore, in wet conditions, the bull dust becomes compact and causes the surface to be slippery and slimy, which can be dangerous if not taking the right precautions.
Prevention.
Controlling bull dust is not possible, however you can control how it affects you and your driving ability. There are a range of prevention measures that can be undertaken to protect a car and a person’s health as well as their safety. 
When driving measures can be taken to reduce the effects caused by bull dust:
Colloquial Term.
Bull dust is also an Australian slang term, it is a euphemism for the term "bullshit", meaning nonsense or rubbish; that someone is lying.