Montana Department of Transportation

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Traffic Data Collection and Analysis

Automatic Traffic Recorder (ATR) and Weigh In Motion (WIM) Reports

Traffic Data Collection & Analysis (TDCA) Section currently has a total of eighty-six permanent counters, fifty-five Automatic Traffic Recorder (ATR) sites and thirty-one Weigh In Motion (WIM) sites throughout the state of Montana collecting traffic data on a daily basis. In addition to providing volume information, a significant number of ATRs and WIMs provide information such as vehicle length, classification and truck weight data.

The primary purpose of permanent counters is to obtain information for: 1) converting/factoring/seasonally adjusting short term counts to estimate Annual Average Daily Traffic (AADT); 2) providing generalized peak and design hour factors for highway geometric design; 3) monitoring monthly and annual traffic trends and 4) providing long term growth factors. As mentioned previously, ATRs and WIMs also provide vehicle classification and weight data as well as unbiased speed data.

If you have questions or concerns, of if you are planning or currently working on a project that might potentially impact an ATR or a WIM site, please contact Becky Duke at 444-6122 or Ron Wuertley at 444-5521.

Annual ATR and WIM Reports

The annual ATR and WIM report provides summary traffic data collected from MDT's permanent traffic counters (ATR and WIM sites). The report includes average weekday traffic and average day of week traffic by month, 10th, 20th and 30th (DHV), 50th and 100th highest hours and, where available, vehicle mix percentages (passenger vehicle and small and large truck). The report contains the historical traffic data available for each permanent count site.

Monthly ATR and WIM Reports

The Monthly Comparison reports provide the change in traffic volumes, as compared to the same month last year (i.e. January 2009 as compared to January 2008), at each of MDT's permanent traffic counter locations. Comparison reports are available for Commercial (trucks) Vehicles (Types 5 - 13), Large Trucks (Types 8-13) and All Vehicles (Types 1-13).

The Monthly Calendar provides traffic volumes by day, by direction and by roadway from MDT's permanent traffic counters.

These reports provide a general overview of the monthly traffic trends at each of Montana's permanent counter locations but the trends are not necessarily representative of the statewide trend.

Commercial Large Trucks All Vehicles Monthly Calendars
Jan 2013 | 2014 2013 | 2014 2013 | 2014 2013 | 2014
Feb 2013 | 2014 2013 | 2014 2013 | 2014 2013 | 2014
Mar 2013 | 2014 2013 | 2014 2013 | 2014 2013 | 2014
Apr 2013 | 2014 2013 | 2014 2013 | 2014 2013 | 2014
May 2013 | 2014 2013 | 2014 2013 | 2014 2013 | 2014
Jun 2013 | 2014 2013 | 2014 2013 | 2014 2013 | 2014
Jul 2013 | 2014 2013 | 2014 2013| 2014 2013 | 2014
Aug 2012 | 2013 2012 | 2013 2012 | 2013 2012 | 2013
Sep 2012 | 2013 2012 | 2013 2012 | 2013 2012 | 2013
Oct 2012 | 2013 2012 | 2013 2012 | 2013 2012 | 2013
Nov 2012 | 2013 2012 | 2013 2012 | 2013 2012 | 2013
Dec 2012 | 2013 2012 | 2013 2012 | 2013 2012 | 2013