You should never drive anywhere too far out in the bush after dark if you can help it.
Kangaroos seem to get mesmerised by the car lights then jump out in front of you at the last minute. I learnt my lesson when first in Australia backpacking, my friend and I hired a car out of Alice Springs and left it too late to drive back to Alice. We had to cope with not only kangaroos but the biggest cattle you have ever seen just casually walking along the road. If the road is bitumen the animals are attracted to it at night when the temperature drops as the road stays nice and warm.
My husband used to drive coaches up to Alice Springs and Broken Hill (often night services) and kangaroos are a frequent problem. Even a coach can get badly damaged. Once his coach door was so badly damaged it wouldn't open!! If you ever do a lot of travelling round Australia by coach at night and you are trying to sleep you keep getting woken up as the driver has to brake sharply to avoid another roo (that's if the potholes don't keep you awake!!). Happy travels!