Many of us are accustomed to the 65MPH speed limit of much of the U.S. interstate highway system. But one might recall that prior to 1987, when Congress passed the Surface Transportation and Uniform Relocation Assistance Act, all interstate speed limits were 55MPH. It was not until 1995 that all 50 states had adopted these increased limits across all of their rural interstates (and some urban, and some non-interstate). However, when these higher speed limits were adopted, was evidence used that demonstrated or credibly projected public safety at these higher speeds? Equally important, was there real world evidence (RWE) , that more effective (and faster) travel had been achieved without increasing harm after the speed limits had been changed?

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