Bibb v. Navajo Freight Lines, Inc.

Summary

The Supreme Court held that Illinois’s rear‑fender splash‑guard statute is unconstitutional because it imposes an undue burden on interstate commerce without providing a safety benefit and conflicts with the regulations of other states. The Court affirmed the district court’s injunction against enforcement of the statute. The decision rests on a balancing of the statute’s commercial impact against the state’s safety interests.