This is one of the biggest pet peeves the Iowa DOT hears from drivers. This pet peeve can also be dangerous. Driving slower than the speed limit or the flow of traffic in the left lane can cause rear-end collisions because approaching drivers are not expecting slower speeds in the “passing” lane.
So what makes the left lane the “passing” lane? The use of highway lanes is governed by Iowa Code section 321.297(2)
The rule of thumb is to drive in the right lane unless you are passing another vehicle. After you pass, move back into the right lane as soon as it is safe to do so.
Be a decent human being and a courteous driver – keep to the right whenever you can: https://youtu.be/UD15vc6lnDc
The fatality count of 133 is an increase of seven since last Monday. In all of 2016, 405 people were killed on Iowa highways. To see statistics published daily by the Office of Driver Services, go to the daily fatality report.