Clean Truck Check in Castle Rock, CO

Nearest in-person tester to Castle Rock

The closest CARB-credentialed Clean Truck Check tester is Jonny’s Diesel Service in Denver, Colorado — about 24 miles away (straight-line). Smart CTC tests over the truck’s OBD port from anywhere, with no drive and no appointment.

Trucking activity in Douglas County

Clean Truck Check applies to heavy-duty vehicles that operate in California — including out-of-state trucks based here that run loads west.

Trucking establishments

80

Trucking employees

430

Source: FMCSA MCMIS carrier census, US Census County Business Patterns 2021.

Freight corridors near Castle Rock

Castle Rock sits on I-25, US-85, CO-177, CO-470, CO-67 and CO-83. Trucks running these routes into California fall under CARB’s Clean Truck Check — Smart CTC lets them test remotely without leaving the road.

Source: OpenStreetMap (© OpenStreetMap contributors).