Data / Site & infrastructure / Access & traffic
Traffic counts (AADT)
All MDT-counted segments statewide for 2025: Interstates, US and state highways, urban routes and many secondary roads (8,560 segments; 7,458 count sites with 2014–2025 history).
About this data
- Published by
- Montana Department of Transportation
Traffic Yearly Counts (TYC) + count-site history - Method
- Downloaded from Traffic Yearly Counts (TYC) + count-site history.
- Update frequency
- Annual
- Last updated
- Oct 6, 2026
- Records
- 8,560
- Coverage
- All MDT-counted segments statewide for 2025: Interstates, US and state highways, urban routes and many secondary roads (8,560 segments; 7,458 count sites with 2014–2025 history).
Records in 56 of 56 counties. - License
- Public record
Known gaps
Most local and county roads are not counted. Short-term counts are adjusted to an annual average, and many years are MDT estimates rather than counts. Truck shares come from MDT's vehicle-class factors.
Preview
The newest or first 500 records. Click a column heading to sort. Use the filter to find a place or a name.
Fields
| Field | Column | Description |
|---|---|---|
| Route | route | |
| MDT count site | site | |
| AADT | aadt | |
| Year | yr | |
| Basis | est | |
| Trucks (all commercial) | trk | |
| Large trucks | ltrk | |
| Lanes | lanes | |
| Desc | desc | |
| Functional class | fc | |
| County | county |
Downloads and links
Data 4 MT is an index of public records. It republishes only what Montana and federal agencies make public, with a link to the source on each record. People are shown as “Private individual” on public pages and downloads; companies, trusts held by institutions, and governments keep their names. No document images, sale prices, voter, MVD or wildlife-telemetry data are stored. Verify any record against the publisher’s copy before relying on it.