On a highway or freeway, if you are driving at a slower speed than other traffic, stay in the lane
Maintain the same approximate speed as surrounding vehicles when possible. However, don't exceed the posted speed limits except momentarily when passing on a two-lane highway where the posted speed limit is 55 mph or higher. (Note: This exception exists in Minnesota but not necessarily in other states.) If you are driving at a slower speed than other traffic, stay in the lane nearest to the right side of the road.