11 June 2026

New City of Chino Hills Statement on CalTrans' Proposed "Improvements" to Carbon Canyon Road

This just in from the City of Chino Hills regarding the proposed "improvements" by CalTrans to Carbon Canyon Road (State Route 142):

 



The City of Chino Hills remains firmly opposed to and is prepared to challenge any decision made by the California Department of Transportation (Caltrans) that would allow large truck traffic to return to State Route 142 (SR-142) and the “S-Curves” on Carbon Canyon Road. Statements made by Caltrans during a June 10 public hearing indicated the agency intends to remove current truck restrictions, regardless of whether roadway safety improvements such as widening of the “S-Curves” are made or not.

For more than seven years, the City worked alongside residents, community members, regional partners, and legislative representatives to address the significant safety concerns posed by large truck traffic of vehicles over four axles along Carbon Canyon Road. Those efforts resulted in truck restrictions that took effect in May 2024, which protect public safety and enhance the quality of life for residents. The City remains committed to ensuring those protections remain in place permanently.

Caltrans is accepting public comments on the project through June 17, 2026. Residents are encouraged to submit comments to be considered as part of the environmental review process by email at D8.1M780.Comments@dot.ca.gov. The City has requested that Caltrans conduct a follow-up public meeting in person to provide additional opportunities for community engagement.

To learn more about about this topic and its history, the June 10 Public Hearing, and how to submit public comments to Caltrans, visit  www.chinohills.org/CarbonCanyon. The City remains committed to advocating for the safety of our community and will continue to provide information related to the project through this website page as it becomes available.

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