When driving on the interstate, you should use the left lane:

Using the left lane on the interstate is primarily intended for overtaking or passing another vehicle. This is a standard traffic rule designed for safety and efficiency, as it allows faster-moving vehicles to navigate around slower traffic without disrupting the flow of traffic in the right lane.

When drivers use the left lane for its intended purpose, it helps maintain an orderly traffic pattern and reduces the risk of accidents that could occur if vehicles are traveling at different speeds in adjacent lanes. Furthermore, it ensures that the right lane remains available for slower vehicles or those who are not intending to pass, thus facilitating smoother movement for all road users.

While regular travel or maintaining speed might seem reasonable in the left lane, these practices could lead to issues, such as congestion or frustration among other drivers who wish to pass. In congested conditions, it’s best to observe the lane usage guidelines, which typically suggest keeping the left lane clear for passing when possible.