Although supporters of a speed limit point to safety and environmental protection, there is relatively little data that speaks for or against a speed limit. At the time, researchers examined the effects of an 81 mph speed limit compared to only a recommended maximum speed. The study found that introducing an 81 mph speed limit reduced injury crashes by about 10% and fatalities or severe injuries by roughly 20%. Fewer crashes with a speed limit of 75 mphBased on this data, the impact of a 75 mph limit can be estimated most reliably. The results show 9% fewer crashes with minor injuries, 26% fewer crashes with severe injuries, and 35 fewer fatal crashes as a result of a local speed limit of 75 mph.