Colo. Rev. Stat. § 42-4-1014 – No commercial vehicles in the left lane - penalty.

(1) A driver of a commercial vehicle may not enter the furthest left lane when driving in the following areas of interstate 70 unless specifically required or authorized to pass by law:
1. (a) Between milepost 115.5 and milepost 131.0 (Glenwood canyon);
2. (b) Between milepost 169.5 and milepost 173.0 (Dowd junction);
3. (c) Between milepost 180.0 and milepost 190.5 (Vail pass);
4. (d) Between milepost 205.5 and 221.0 (Eisenhower-Johnson tunnel);
5. (e) Between milepost 224.0 and milepost 228.5 (Georgetown hill); and
6. (f) Between milepost 243.0 and milepost 247.0 (Floyd hill).
(2) Any person who violates subsection (1) of this section commits a class A traffic infraction.

Source: L. 2024: Entire section added, (SB 24-100), ch. 207, p. 1277, § 3, effective August 7. L. 2025: IP(1) amended, (SB 25-300), ch. 428, p. 2460, § 72, effective August 6.

Cross references: For the penalty for a class A traffic infraction, see § 42-4-1701 (3)(a)(I).