Montana Department of Transportation

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Traffic Data Collection and Analysis

Traffic Maps

Please note: If you are working on or contracted to do an MDT project, do not use traffic data from this map. Please continue sending your formal traffic data requests through the of MDT.

Welcome to MDT's new Interactive Traffic map!

We hope you find the enhanced map and its new features useful.

Note: There are multiple layers of information being displayed on the map therefore you must zoom in to see the dots identifying the Count Sites.

The pop–up box displays data in multiple slides – scroll through the slides using the arrow at the top of the box.

Statewide Traffic Count Site Map

The Statewide Traffic map below is an interactive map that displays published traffic data graphically. Click on the features in the map to display details. The interactive map currently displays the most current traffic data available for the following:

Traffic Flow segments – Each roadway is broken into homogenous traffic segments for traffic collection and reporting purposes. Together these roadway segments form a connected road network. You can view the traffic segments and its corresponding Annual Average Daily Traffic (AADT) and Annual Average Daily Truck Traffic (AADTT) by clicking on the roadway segment.

Traffic Count Locations – Shows the actual placement of the short term traffic counter and permanent ATR/WIM sites within the Traffic Flow segment.

AADT: Annual Average Daily Traffic – An estimate of the traffic volume one can expect to see on the roadway segment on an average day.

Daily Vehicle Miles Traveled (DVMT) by County – County level DVMT is generated by multiplying each roadway segment's Annual Average Daily Traffic (AADT) by the segment’s section length and then summing the DVMT for the roadway segments within the county. The shading on the map provides a quick view of the distribution of DVMT by county – the darker the shading, the higher the DVMT. DVMT is reported for On System (Interstate, NI-NHS, Primary, Secondary and Urban) and Off System routes.

The following information is provided in the pop up boxes for each traffic count location:

  • Description: description of the count site location
  • Site ID: Unique ID used to identify count sites (ex: 25-7C-86)
    Please reference the Site ID when requesting additional traffic information for a count site.
  • County: County in which the count site is located
  • Departmental Route: MDT route naming convention (ex: N-5)
  • Corridor Route: MDT route naming convention (ex: C000005)
  • Owner: Agency responsible for conducting the traffic count
  • ATR: ID for the Automatic Traffic Recorder (ATR) or Weigh In Motion (WIM) sites. ATR and WIM sites collect traffic data year round from sensors imbedded in the roadway. If this field is null the site is a short–term (36 to 48 hour) count site.
  • AADT (Annual Average Daily Traffic): The (A) following the AADT indicates that the count was conducted for the year and the (E) following the AADT indicates that the count has been Estimated based on historical traffic count data. The (M) denotes a Manually entered number which is the same as an Actual count.

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We encourage our customers to use our online traffic maps. Using these resources will enable our customers to receive traffic data when they need it. However, if you still need the assistance of our office, please send an or call 406-444-6374.

Traffic Flow Map

This is a map showing traffic flow in Montana. Annual Average Daily Traffic (AADT) has been weighted based on established major traffic breaks. The map is intended to give users a general idea of the traffic flow in Montana.

Please note that the 2011 map is only showing AADT. AADT and Commercial values can be found on the 2009 map. More current commercial data can be requested from the .

ATR and WIM Map

The ATR and WIM map below is an interactive map that displays only the permanent sites. Click on any of the features in the map to show their details.


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811: Call Before You Dig

TDC&A currently has the ATR and WIM sites spatially located with the 811 Call Before You Dig center for Montana. We receive Locate Tickets when work is being done close to a site. We have 48 hours to locate our equipment and most of the time we don’t have staff in the immediate area to do a locate. That is where TDC&A is hoping to gain the assistance of the maintenance sections to help us locate our equipment.

The list below is in order by Maintenance Section number. If your maintenance section is listed then you have at least 1 or more ATR/WIM sites in your area and you might be called to help locate a site.

The ATR and WIM map above also displays MDT Maintenance Sections! Zoom to your maintenance section to see if you have an ATR/WIM site located within the boundaries of your section. We appreciate your help!

Disclaimer: This data set is provided "as-is" without warranty of any kind. The Montana Department of Transportation makes no representations or warranties whatsoever with respect to the accuracy or completeness of this data set and assumes no responsibility for the suitability of this data set for a particular purpose; and MDT will not be liable for any damages incurred as a result of errors in this data set.