Do I Need Chains on I-80?

It depends on the chain control level. During R1, AWD/4WD vehicles with snow tires can proceed without chains. During R2, AWD/4WD with snow tires on all four wheels may proceed without chains, but you must carry them. During R3, ALL vehicles including AWD and 4WD must have chains on the drive axle — no exceptions.

You need a minimum of 2 chains, installed on your drive wheels. For front-wheel-drive cars, chains go on the front tires. For rear-wheel-drive, chains go on the rear. Caltrans requires chains on the drive axle. If you have AWD, chains are recommended on the front axle when required.

Yes, AutoSock is a Caltrans-approved alternative traction device for R1 and R2 chain controls. However, during R3 controls, only traditional metal chains are accepted — no exceptions. CHP officers at checkpoints have final say on whether your traction device is adequate.

Chains are required during winter storms, typically between November and April. Caltrans activates chain controls based on current road and weather conditions. Controls can go into effect at any time during a storm and are lifted when conditions improve. Check this page for live status.

R1 means chains are required except for vehicles with snow tires or AWD/4WD — you must still carry chains. R2 means chains required except AWD/4WD with snow tires on all four wheels. R3 means chains required on ALL vehicles including AWD and 4WD. R3 usually precedes a full highway closure.

Eastbound chain controls typically start at Applegate (Exit 135) or Kingvale (Exit 165). Westbound controls start at Truckee Scales (Exit 186) or Nyack (Exit 174). Chain installers are often available at these checkpoints for $30-50, or you can install them yourself in designated chain-up areas.

Check the live status at the top of this page for current chain control levels. For full route conditions including traffic, cameras, and incidents, visit our I-80 Road Conditions page for real-time updates.

Chain controls are most common during active snowfall, typically in the afternoon and evening. Early morning (before 7 AM) often has the best conditions as overnight plowing clears the road. Midweek trips see fewer controls than weekends. Check the forecast and plan to arrive before or after the heaviest snowfall.