Dynamic Message Signs (DMS) — those big electronic boards over highways — display real-time traveler information: incident warnings, travel times, amber alerts, construction notices.

Road511 captures the current message from every DMS sign across 30+ US states and Canadian provinces. Nobody else aggregates this data.

What You Get

curl "https://api.road511.com/api/v1/features?type=signs&jurisdiction=GA&limit=10" \ -H "X-API-Key: your_key"

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{ "data" : [ { "id" : "ga-sign-i85-042" , "jurisdiction" : "GA" , "name" : "I-85 NB at Clairmont Rd" , "latitude" : 33.8103 , "longitude" : -84.3179 , "properties" : { "message" : "CRASH AHEAD / I-85 NB AT SR 42 / RIGHT LANE BLOCKED" } } ] }

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The message field contains the exact text currently displayed on the sign, including line breaks encoded as / .

Why This Matters

DMS messages are a leading indicator.…