October 9, 2017
If you spend much time on multi-lane highways, you’ll probably run into those drivers who think the left lane was put in specifically for them. That might be true, as long as the vehicles using the left lane are passing slower vehicles in the right lane.
On a highway of four lanes or more, the right lane in each direction is considered the driving lane and the left lane, the passing lane. Although the Iowa DOT has 695 “SLOWER TRAFFIC KEEP RIGHT” signs posted on the Primary Highway System, not all drivers notice them or understand the meaning behind the signs. Others see the signs and think it gives them the right to tailgate or otherwise endanger the safety of slower traffic that might be in the left lane.