Winter driving demands skills and equipment habits that many new CDL drivers haven't yet developed. Storms in mountain and northern-plains corridors can transition from "fine" to "shutdown" within hours. Winter driving mastery starts with knowing when to stop.
Knowing when to shut down
Most carriers grant drivers explicit authority to shut down for weather. Use it. The right time to shut down is before conditions become genuinely dangerous, not after — visibility under 1/4 mile, sustained icing, sustained winds over 60 mph, or any chain-required restriction without chains aboard are all legitimate reasons to find safe parking and wait it out.
Tire chains
Chain laws apply on most western mountain passes from October through April. Carry enough chains for federal compliance: typically two chains for the drive axles plus one chain for the trailer (rules vary by state). Chains must fit your tire size — verify before the season starts. Practice chain installation in your home yard before your first chain-up situation.
Chain-up areas
Most mountain corridors have designated chain-up areas at the base of major grades. These are wide shoulder areas with adequate lighting (sometimes) and emergency-vehicle access. Chain installation in active traffic on a narrow shoulder is dangerous; use the designated areas. Many chain-up areas have sand or salt buckets for traction during the chain-up process.
Cold-weather pre-trip
In cold weather (below 20°F), the pre-trip takes longer: air-tank water can freeze and seize valves; brake chambers can have ice buildup; fuel filters can gel (use a winter blend or fuel-treatment additive in extreme cold); door seals can freeze shut; windshield washer fluid must be the winter formulation. Allow extra time for the pre-trip in winter.
Idle policies
Federal and state anti-idling laws restrict cab idling for non-essential purposes — typical limits are 5 to 15 minutes of idling per stop. Most modern Class 8 trucks have APUs (Auxiliary Power Units) that provide cab heat and power without idling the main engine. APUs are explicitly exempted from anti-idling laws. If you don't have an APU, dress for the cold and use proper cold-weather sleeping bags.
Frozen brake systems
Frozen air-brake components are common in extreme cold (below 0°F). If your brakes don't release after a parking-brake reset, do not force the truck to move — frozen brake shoes can be torn off the drum. Bring a small propane torch (used carefully) or call road service. The 30 minutes of waiting beats a $3,000 brake-component replacement.
Black ice and bridges
Bridges freeze before road surfaces because both top and bottom of the deck lose heat to the air. Reduce speed approaching every bridge in marginal-temperature conditions. Black ice (transparent ice on dark pavement) is invisible until you're on it; if you see other vehicles spinning out, slow down dramatically.
Lock-out / tow recovery
Save the road-service number for your insurance policy. Carry cash for emergency situations where credit cards aren't accepted. Tow recovery in extreme winter conditions can cost $1,500 to $8,000.