US-550N traction law code 15

Northbound and southbound open. Between US Basin Brooklyns / 825 (9 miles north of the Silverton area) and Forest Service Road 871 (Ouray) from Mile Point 80 to Mile Point 95. Passenger vehicles that are all-wheel drive (AWD) or four-wheel drive (4WD) must have winter (Mountain Snowflake icon) or mud and snow (M+S or M/S) or manufacturer rated all-weather tires with adequate tread depth of at least 3/16 of an inch. Two-wheel drive (2WD) vehicles are required to have chains or an approved traction device.