You are driving on expressway with three lanes in your direction at a speed lower then
other traffic you should

Take the lane that is more to your right

Explanation:

Every state in America has some law that restricts the use of the left lane; to be more specific in 29 states, any car that's moving slower than the nearby traffic should be in the right lane and in 11 states the left lane is just for turning or passing. This is a standard, and the reason is to avoid accidents and traffic jams; if there are slow cars on all the lanes the sped cars have to move from one lane to the other to pass the slower cars increasing the risk of accidents and slowing the traffic down.