Highway mile markers and live DOT road alerts — all 50 states + British Columbia, one normalized API.
Nobody else has done the work of normalizing 50+ separate state DOT feeds — each with its own format, auth, and quirks — into a single consistent schema. We already did it for our app. You can build on it too.
Every state and province speaks a different DOT dialect. MileCheck normalizes them all into one consistent response shape.
Turn GPS coordinates into the nearest highway mile marker — route, milepost, and direction.
Closures, crashes, construction, and road-weather — classified and normalized from live state feeds.
51 upstream feeds, each with its own auth and shape. When one breaks, we fix it — not you.
Base URL: https://milepost-proxy.leahgerber93.workers.dev
MileCheck?apikey=YOUR_KEY), an x-api-key header, or an Authorization: Bearer YOUR_KEY header. Don't have a key yet? Email sales@milecheckapp.com.
Coordinates in, nearest highway mile marker out.
lat and lon required · state optional (2-letter code, narrows the search)
Request
curl "https://milepost-proxy.leahgerber93.workers.dev/v1/locate?apikey=YOUR_KEY&lat=47.869&lon=-121.760"
Response
{
"milepost": 25,
"route": "SR 2",
"route_class": "S",
"state": "WA",
"direction": null,
"distance_mi": 0.04,
"coordinates": { "lat": 47.869404, "lon": -121.760126 },
"query": { "lat": 47.869, "lon": -121.76 }
}
Live, normalized DOT road conditions and incidents for a state — closures, crashes, construction, road-weather.
state (2-letter code) or lat + lon required · bbox=minLon,minLat,maxLon,maxLat optional · limit=N optional
Request
curl "https://milepost-proxy.leahgerber93.workers.dev/v1/alerts?apikey=YOUR_KEY&state=WA"
Response (abridged — arrays truncated)
{
"state": "WA",
"generated_at": "2026-08-31T18:42:00Z",
"counts": { "conditions": 16, "incidents": 184 },
"conditions": [ /* road-weather-reports */ ],
"incidents": [ /* incident-reports: closures, crashes, construction, etc. */ ],
"source_status": { "conditions": "live", "incidents": "live" }
}
Active wildfires across the U.S. (NIFC/WFIGS) and British Columbia — name, size, containment, cause, and location.
state optional · bbox=minLon,minLat,maxLon,maxLat optional · limit=N optional · exclude_rx=1 optional (hide prescribed burns)
Request
curl "https://milepost-proxy.leahgerber93.workers.dev/v1/fires?apikey=YOUR_KEY&state=OR"
Response (abridged — array truncated)
{
"generated_at": "2026-08-31T18:42:00Z",
"source": "NIFC/WFIGS + BCWS",
"count": 37,
"fires": [
{
"id": "2026-ORXYZ-000123",
"name": "Cedar Creek Fire",
"acres": 4210,
"containedPct": 35,
"state": "US-OR",
"county": "Lane",
"cause": "Lightning",
"lat": 43.87, "lon": -122.12,
"isNew": false, "isRx": false
}
]
}
Live demo of /v1/locate. Drop in a key, adjust the coordinates, and hit Locate.
Launch pricing — subject to change.
For evaluation and early integration work.
Best for variable or growing usage beyond the free tier.
High-volume use, SLA, and invoiced billing.
Highway mile markers and live DOT road alerts for all 50 US states plus British Columbia. Alert coverage (closures, crashes, construction, road-weather) is normalized from over 50 separate state and provincial DOT feeds into one consistent schema.
/v1/locate turns GPS coordinates into the nearest highway mile marker (route, milepost, direction). /v1/alerts returns live, normalized road conditions and incidents — closures, crashes, construction — for a state or a location.
Every request needs an API key, passed as a query parameter, an x-api-key header, or an Authorization: Bearer header. Email sales@milecheckapp.com to request one.
The Business tier includes a service-level agreement and invoicing for high-volume or mission-critical use. Contact us to discuss terms.
Mile-marker positions come from state DOT reference-marker datasets. Road alerts come directly from each state and provincial DOT's live traffic feed, normalized by MileCheck into one schema.
Tell us what you're building and we'll get you a key. Free tier available today; the API is launching, not yet self-serve.