The speed limit in Adelaide is usually 60 kph. If you drive 70 kph instead and you are caught it costs you AUD 133. :(
Drivers in Adelaide are very considerate. There is not so much fighting and showing off as I knew it from other cities. Only riding a bike is quite dangerous on main roads without bicycle path. Cars pass incredibly close to your bike and if you are not knocked off, you might die from a heart attack.