Skip to ContentBefore you drive from Reno to Truckee or Tahoe in winter, know what the three chain-control levels mean and where the live road maps are.
Checked November 3, 2026. Dates, prices and hours change; the official page wins.
- 3Caltrans chain levels
- 6,000 lbR-1 weight limit for the snow-tire exemption
- Oct 15-May 1typical nvroads snowplow data
- 511Nevada traveler info site
Read from official pages on November 3, 2026: Caltrans chain controls and nvroads.com. Conditions change by the hour; the live map wins.
California Chain Controls
| Level | What Caltrans says |
|---|---|
| R-1 | Chains required on most vehicles. Passenger vehicles and light trucks under 6,000 lb gross weight are exempt if they have snow tires on at least two drive wheels, but must carry chains. |
| R-2 | Chains or traction devices required on all vehicles except those with snow-tread tires on all four wheels. 4WD/AWD vehicles are exempt from the tire requirement but must carry traction devices. |
| R-3 | Chains or traction devices required on all vehicles, no exemptions. |
Caltrans defines only three levels and says some local areas use variations; signs along the road show the requirement. Snow-tread tires are marked MS, M/S, M+S or MUD AND SNOW.
Live Road Information
California: Caltrans QuickMap. Nevada: nvroads.com, the Nevada 511 site run by NDOT, with a map of traffic events, cameras and weather. Its legend includes “Chains or Snow Tires Required”, “Chains Required, All Vehicles except 4-wheel drive with Snow tires”, “Adverse Driving Conditions” and “Road Closed”. It shows snowplow data typically between October 15 and May 1.
Routes on This Site
Interstate 80 over Donner Pass reaches Truckee in about 35 to 45 minutes from Reno by our estimate (no live traffic). The Mt. Rose Highway reaches Mt. Rose. Virginia City’s mountain roads can be icy in winter per our Virginia City page.
On The Map
What We Could Not Confirm
These items were not read on an official page when we checked, so we do not state them as fact. Who can confirm each one is named.
- Nevada traction-device and chain rules (NDOT pages returned an error).
- Nevada 511 phone number.
- Current road status.
More to Explore
Frequently Asked Questions
What is R-2 chain control?
Caltrans says chains or traction devices are required on all vehicles except those with snow-tread tires on all four wheels; 4WD or AWD vehicles must still carry traction devices.
Sources
Cite this page: It’s Reno editorial team, “Winter Driving to Tahoe: Chain Controls and Live Maps,” itsreno.com, checked November 3, 2026.