Traffic situations · Other traffic situation
When driving on an interstate highway or full access controlled freeway, a person is not a

When driving on an interstate highway or full access controlled freeway, a person is not allowed to drive in the left lane(s) unless passing another vehicle. Exceptions include the following situations:
• No other vehicle is directly behind the vehicle in the left lane.
• Traffic conditions/congestion make it impractical to drive in the right lane.
• Weather conditions make the driver use the left lane(s).
• There is an obstruction or hazard in the right lane.
• The driver is changing lanes to give the right of way to emergency or construction vehicles.
Learn it with your state's rules
DMV One Way teaches the whole handbook slide by slide and checks it with practice questions.