Four of the biggest names in the trucking industry are taking California to court, arguing the state should not be allowed to enforce its tough new emissions rules. California is no stranger to strict vehicle laws, often ranking high among states with the strictest traffic laws . But this fight is less about speed limits and seat belts, and more about how clean heavy-duty trucks need to be in the future.

The Dispute at the Heart of the Case

Daimler Truck North America, Volvo Group North America, Paccar, and International Motors (formerly Navistar) filed their lawsuit in federal court in Sacramento on August 11. They say recent federal changes have removed California's ability to set its own standards for truck emissions. The tipping point came in June, when U.S. President Donald Trum

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