Yeah, I agree with CJ - it really is totally impractical. The stretch of road I was talking about above is the Sturt Highway, which goes from Adelaide to about 2hrs south of Sydney (a distance of ~1200km).
The state governments have actually tried to reduce the speed limits in some areas several times, and the effect has been an increase in accidents due to driver fatigue. So it seems to be a no win situation.
People who travel in these areas frequently know to watch out for Roo's when driving at dusk/night - it's the only way to protect you, your car and the wildlife
Looking forward to the next chapter CJ! (I soo wouldn't want to be in Eric's place right now ...)