Chain Control Status Chart

Chain Control status code and description
Status Status Description
R-0 No chain controls are in effect at this time.
R-1 Chains, traction devices or snow tires are required on the drive axle of all vehicles except four wheel or all wheel drive vehicles.
R-1 MODIFIED Trucks and vehicles pulling trailers require chains, traction devices or snow tires on the drive axle of all vehicles except four wheel or all wheel drive vehicles.
R-2 Chains or traction devices are required on all vehicles except four wheel / all wheel drive vehicles with snow treaded tires on all wheels.
R-3 Chains or traction devices are required on all vehicles, no exceptions.
ESC The California Highway Patrol is escorting all traffic due to weather conditions.
TH All truck trailer combinations are being held at the chain control camper due to incidents or weather related conditions.
TS All trucks must stop at the chain check point, Caltrans is currently screening for chains. Drivers must have maximum chains in their possession in order to proceed. Trucks without chains will be turned around. Permit loads are prohibited over the summit.
TTA All truck trailer combinations are being turned around at the chain control camper due to traction problems over Donner Summit.
TTS All single axle drive trucks pulling a trailer are being turned around at the chain control camper due to traction problems over Donner Summit.
TTSD All single axle drive trucks pulling a set of doubles are being turned around at the chain control camper due to traction problems over Donner Summit.
VM A traffic control is in effect to meter vehicles at the chain check point in order to reduce traffic congestion in the mountain areas.
HT All traffic is being held at the chain control check point due to incidents or weather related conditions.
MIN Truck chain requirements are minimum for all trucks using Donner Summit.
MAX Truck chain requirements are maximum for all trucks using Donner Summit.
W No Restrictions - Watch for snow on pavement.
RC Closed to traffic.
Road Closed Closed to traffic.
Not Reported Condition Not Reported

 

 

Chain Control Status Reporting Matrix

Chain Control status code and distict using the status
R = District using this status code
Condition 1 2 3 4 5 6 7 8 9 10 11 12
R-0 R R R R R R R R R
R-1 R R R R R R R R R
R-1 Modified R R R R
R-2 R R R R R R R R R
R-3 R R R R R R R R
ESC R R R R
TH R R
TS R R
TTA R
TTS R
TTSD R
VM R R
HT R R
MIN R
MAX R
W R
RC R R R
Road Closed R R R R R R
Not Reported R R R R R R R R R