What time was it? Before sunrise but that usually means there's light enough around and anyone who drives in Oz knows that dawn/dusk are bad for kangaroos crossing roads so should be taking extra care. 'Should be'
The AFP tested the car’s remaining front light and found the light to be below the required brightness to pass a roadworthy test in both NSW and the ACT
"it was dark at the time and would have been hard for a motorist to see"
What if vehicles had some kind of anti-dark thing mounted to them?