C.R.S. § 42-4-411
42-4-411. Applicability of this part to heavy-duty diesel fleets of nine or more
42-4-411. Applicability of this part to heavy-duty diesel fleets of nine or more. Diesel-powered motor vehicles subject to the provisions of section 42-4-414 shall not be subject to the diesel emissions inspection program set forth in this part 4 unless the conditions set forth in section 42-4-414 (3)(c) have been met.