Milepost data and road conditions for your platform.

Milepost dataset

Every interstate, US highway, and most state routes in all 50 states. Sourced from official DOT and GIS records, never crowdsourced, interpolated to one-tenth of a mile between markers.

• Coverage — 50 states, updated when routes are added or reclassified.
• Fields — route ID, mile, latitude, longitude.
• Delivery — structured dataset export, or continuous sync.
• Also includes — a navigate-to-milepost primitive (a marker as a routing target, handed off to Google Maps, Apple Maps, or Waze) and the same data on CarPlay and Android Auto.
• Limitation — positions are interpolated between physical signs, not individually GPS-surveyed.

Live conditions API

50 state DOTs and 3 Canadian provinces, each on a different upstream platform, normalized into one schema. Closures, construction, crashes, chain controls, and weather — referenced by highway and milepost.

• Coverage — 50 states + 3 provinces, 19 upstream formats, one schema.
• Also normalized — live CBP commercial border-crossing waits, and movable-bridge open/closed status (Seattle, Florida).
• Refresh — matches each source's own posting cadence; every feed is monitored, not polled blind.
• Unavailable-source behavior — ten states' live feeds don't carry crash data at all (Alaska, Arkansas, Hawaii, Kentucky, Maine, North Dakota, New Mexico, Oklahoma, South Dakota, West Virginia); the API says so rather than returning a silent zero.

Real response, pulled live

{
  "event-type-id": "CL",
  "headline": "Bridge demolition work on 101-LOOP Southbound from W Indian School Rd (MP 4) to I-10 Eastbound (MP 2). All lanes closed.",
  "location": {
    "route-id": "SR-101",
    "direction": "South",
    "start-location": { "start-mile-marker": "4", "start-lat": 33.4939, "start-long": -112.2641 },
    "end-location":   { "end-mile-marker": "2",   "end-lat": 33.4655,   "end-long": -112.2688 }
  },
  "is-full-closure": true,
  "severity": "Minor",
  "start-time": 1790395200,
  "end-time": 1790596800
}

Arizona DOT, live on /v1, pulled September 25, 2026.

Historical archive

Every state DOT and Canadian provincial feed (DriveBC, Alberta, Manitoba), saved on a schedule — a growing record of road-feed snapshots.

• Collection interval — every two hours since September 2026, daily before that, back to mid-August.
• Gaps — a jurisdiction's history starts the day its live integration went in, not before.
• What it's produced — real crash-clearance times, bridge-raise duration histograms, and border-wait curves by hour and day, measured rather than estimated.
• Delivery — a dated export, or a continuous sync, separate from the live API.