Clean Truck Check Credentialed Tester

Clean Truck Check in Marion, IL

1 credentialed tester in Marion.

Testers in Marion

Nearest in-person tester to Marion

The closest CARB-credentialed Clean Truck Check tester is Dynamic Transit CO> in Granite City, Illinois — about 95 miles away (straight-line). Smart CTC tests over the truck’s OBD port from anywhere, with no drive and no appointment.

Trucking activity in Williamson 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
38
Trucking employees
475

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

Freight corridors near Marion

Marion sits on I-24, I-57, US-45, US-51, IL-13 and IL-148. 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).

Nearby truck stops

OpenStreetMap-tagged truck stops, services areas, and HGV-marked fuel stations within 25 miles of Marion. Useful for routing a service stop around your CTC test.

+2 more within 25 miles.

Source: © OpenStreetMap contributors. Last updated 2026-05-26.