The safety benefits of roundabouts over signalized intersections have been well-established for vehicular traffic, with previous studies showing decreases in fatal and serious injury crashes. But many stakeholders continue to perceive that heavy commercial vehicles are at risk and may overturn when navigating a roundabout. A MnDOT investigation comparing commercial vehicle crash data between roundabouts and intersections with traffic signals found fewer total crashes and serious crashes in roundabouts compared to other intersections, particularly after MnDOT modified roundabout design guidance to address commercial vehicle concerns.