The minimum age of a driver is 18 years. The legal blood alcohol limit is 50 mg and penalties for exceeding it are extremely severe.
Trams always have priority.
It is illegal to drive off-road. Headlights must be on at all times while driving. Excessive use of horns is illegal. Trams in Oslo should be passed on the right, but they may be passed on the left if there's no room on the right or if travelling on a one-way street. Police are empowered to collect fines on the spot.