https://m.tirerack.com/tires/tiretec...jsp?techid=125
I vaguely, perhaps falsely, remember seeing a sign somewhere that read:
'Three peak tires and chains on board required'.
You might get a pass through the pass if you have three peak.
A hint:
If you haven't installed snow chains onto frozen/caked dual tires, alongside the road, in a crowded pullout, in a windstorm...
Don't be so silly as to think you can install snow chains onto frozen/caked dual tires, alongside the road, in a crowded pullout, in a windstorm.
Chains are a practice multiple times at home, from scratch, unload, install, remove, load, unload, install....
MANY chain install turnouts have time limits and fines for going over those time limits.
Punchline:
If you haven't...
Don't