Quensland, Australia restive horse law

In Quensland, Australia, drivers must give way to a restive horse. What this means is that if you are in a car driving along the road, and you happen to encounter a horse whom seems distressed, be it by your car or another cause, you are required to not only move to the side of the road, giving space for the animal to be rode on, but also switch off your engine until a suitable time when the movement or noise of the car will not affect the horse.

Although this law seems strangely specific, it is actually relatively logical unlike many other strange laws. The reason being that you obviously don't want to stress the horse out as that could become a tricky situation seeing as the animal is so large. Also in consideration is the person riding the horse as you would not want the situation to lead to someone getting injured. From what I gather this law would have been invented relatively early on in the production of cars, as back then they would have been much louder and startling for the horses. not to mention the fact that the horse and carriage would have been in strong use, and horses would have "ruled the road", not cars.