Bibb v. Navajo Freight Lines, Inc.

Summary

The Court held that Illinois's rear‑fender splash‑guard statute violates the Commerce Clause because it imposes an undue burden on interstate motor carriers without a safety benefit. The statute conflicts with Arkansas regulations and hampers interline operations, and the Court affirmed the district court’s injunction. Justice Harlan, joined by Justice Stewart, filed a concurring opinion emphasizing the heavy cost and lack of safety advantage.