At about 11:30AM, in the day, today I had to stop suddenly for a family of 8 emus crossing the road just a few km south of where I live. The juveniles were almost fully grown. I have hit an emu before, they are big heavy birds and make a big dent in the car and it is terrible if they do not die immediately. Most people do not carry anything that can be used to kill an injured animal, using a big rock attracts unwanted attention and photos and may lead to legal action. Seeing wild life on the road in the middle of the day is a rarity and a big surprise when you are doing 100kmh, but I saw them soon enough to be able to safely stop and not get run into by another car.
However, the fact that we are seeing the animals is a good sign that they are still alive and well in numbers and are not going extinct.
Many Australian drivers will not drive on rural roads at night to avoid hitting the wildlife. If they have to drive, most slow down and exercise a lot of care. But trucks and stupid drivers are killing the wildlife all the time.