Style, reliability, and price are key factors you may consider when purchasing a new or used vehicle. Yet, above all, safety is a top priority for most buyers. Driver-assistive safety features, passive safety devices, and response to crash scenarios are all factors that IIHS uses in determining a vehicle's overall safety ranking. Not only do they compare vehicles, like Volvo, to comparable models in their class, but they also put them through crash testing scenarios to rank how crash-resistant they are, as well.