You are in the right lane of a four-lane highway. You see an emergency vehicle pulled over ahead with its lights flashing. What should you do?

Explanation

Under Arizona's Move Over Law, when you encounter any vehicle (emergency vehicle, tow truck, etc.) that has pulled over with its flashing lights on, you must move into a non-adjacent lane if possible, leaving at least one vacant lane between you and the vehicle. If this is impossible (no other lanes in your direction) or unsafe, you must slow down until you have passed the vehicle. (Note: All US states now have their own Move Over Laws, but some of them require drivers to do different things. When traveling out of state, always check the local traffic laws.)