Overview
- Two‑wheel‑drive and front‑wheel‑drive vehicles on the I‑70 mountain corridor must carry approved chains or traction devices from September through May and install them when snow begins.
- Four‑wheel‑drive and all‑wheel‑drive vehicles must use tires rated for winter, mud‑and‑snow, or all‑weather with at least 3/16‑inch tread depth, or install approved devices if they do not meet the standard.
- CDOT can activate the passenger‑vehicle traction law during storms on any state highway, with highway signs used to notify drivers.
- CDOT and Colorado State Patrol held a news conference to explain the changes, promote the quarter test for tread checks, and steer drivers to partner shops offering inspections and discounts.
- Commercial trucks must carry chains from Sept. 1 to May 31, and drivers can face fines up to $1,000 for blocking traffic without chains, according to authorities.