A chain restriction on one pass doesn't tell a dispatcher anything about the next one. Traction laws are set by each state, enforced at that state's own checkpoints, and can change within the hour as weather moves through — which means a truck running a route that crosses two or three states is really crossing two or three different rule systems, each with its own escalation levels and its own way of publishing them.

Same idea, different rulebook

California's system escalates through R1, R2, and R3 — see What “Chains Required” Means for exactly what each level requires and who it applies to. Other states run their own versions of the same idea, posted through their own DOT systems, on their own schedule. A driver who has California's levels memorized still has to relearn the posted rule at the next state line.

The checkpoint is the least convenient place to find out

The restriction is usually confirmed at the pass itself — a posted sign, a state DOT report, a live camera — which is exactly the point in the trip where turning back or pulling over to chain up costs the most time. For a single driver, that's a delay. For a dispatcher routing several trucks across a corridor overnight, it's a decision that needs to be made before anyone reaches the checkpoint, not at it.

One feed across the whole corridor

MileCheck's live DOT alert layer carries chain-control and traction-law postings as part of the same normalized feed as closures, crashes, and construction — tied to the route and mile marker, direct from each state DOT, in the same schema no matter which state issued it. A dispatcher watching a multi-state run sees the same kind of alert the same way, whether the truck is approaching a pass in California, Colorado, or Washington. Current conditions for named passes — Snoqualmie, Donner, the Eisenhower Tunnel, and others — are free to check any time on MileCheck's live mountain pass conditions.

Available beyond the app

This is the same data layer available to license for fleet and dispatch platforms — see the partner page for the licensing models, or find MileCheck already running inside a fleet tool on the Geotab Marketplace.

Keep reading

Related: Why fleet dispatch still runs on mile markers  ·  What it takes to get live DOT alerts from all 50 states  ·  All mountain pass conditions