MileCheck

Chain control map

Chain controls and traction rules that state DOTs are posting right now, with route and mile marker. Most show up in the western mountain states from late fall to spring. Updates every 5 minutes. Always follow the signs on the road. How-to: putting on chains · what chains required means

Pick a state or zoom in. Chain rules load at state level
Chain rules in view
Pick a state to load chain rulesOr zoom the map into your area. They come straight from each state DOT and refresh every 5 minutes.

Know where you are relative to what's closed.

Chain rules are posted by route and mile marker, and MileCheck shows yours in real time, plus these alerts on your route. Works offline in all 50 states.

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About this data: chain controls and traction rules come from state DOT feeds, the same ones behind the MileCheck app. Not every state publishes chain rules in its feed, and some post them only on their own 511 sites, so check the state DOT before you drive a pass. For closures, see the road closures map.

Mile markers in all 50 US states.

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© 2026 MileCheck LLC. Chain rule data: state DOTs via MileCheck. Always follow posted signs.

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