Who sets traffic rules on the Interstate System?
Because the States own and operate the Interstates, the States establish the operating requirements, such as speed limits. The States also are responsible for enforcement. The National Committee on Uniform Traffic Laws and Ordinances (NCUTLO), which includes State motor vehicle administrators and police officers, publishes a compendium of model traffic laws and rules of the road. The goal of NCUTLO is to promote uniformity across the States, but each State is free to adopt its own traffic laws and rules based on its unique circumstances.
