From LCA2014 Delegate Wiki
Many people are likely to drive to Perth, whether it's driving all the way from home, or hiring a vehicle from the airport. Of particular note to international Speakers and Delegates, please be aware that Australia has some of the toughest drink driving laws in the world. The blood alcohol limit is 0.05, and it is strictly enforced. As an organising team, we're working extra hard to put on extra buses to/from all official events to prevent the need to drive. Don't be a bloody idiot: If you drink, don't drive.
And if you're staying in Perth and not driving, or you're a local, have fun but stay safe - Friends don't let friends walk home drunk.