This restriction is code 15. Definitions under the colorado chain law, a commercial vehicle is defined as being Colorado Child Passenger Safety Law Flier Child Passenger Safety Car Seats Child Car Seat Colorado chain law is not just for large commercial vehicles. Colorado chain laws for cars . Including passenger vehicles, crossovers, suvs, and small trucks can be put into effect in colorado at any time when weather conditions are severe, primarily on roadways with significant ascending and descending grades. In some areas of the state, lighted variable message signs will A chain law restriction for vehicles weighing less than 16,001 pounds—including passenger vehicles, crossovers, suvs and small trucks—can be put into effect in colorado at any time when weather conditions are severe, primarily on roadways with significant ascending and descending grades. 1 to may 31 while on the i70 corridor, from dotsero (mm 133) to golden (mm 259). Traction law (code 15), passenger vehi...