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State Highway Administration

Traffic Monitoring System


The Traffic Monitoring System (TMS) Team administers the Maryland State Highway Administration's Traffic Monitoring Program. The program is responsible for the collection, processing, analysis, summarization, and dissemination of Maryland highway traffic data and is supported by a comprehensive, user friendly, management information computer database system.

Traffic Monitoring System Program

This document provides a brief description of our program, the sources, methodologies and procedures used to collect, validate; calculate and apply adjustment, axle-correction, and growth factors; and calculate Annual Average Daily Traffic (AADT) counts. In addition, the document describes the traffic data reports that culminate from the process, such as the Traffic Trends Report, the Traffic Volume Maps, and the Truck Volume Maps.


Data Collecting Information

The most recent information and templates for our data collecting consultants.


AADT Locator 

This is a very simple tool wherein a user can enter a full or partial street address to find AADT's for that address (if one exists) by way of the Address Search option. The tool displays AADT & AAWDT (Annual Average Weekday Traffic) for locations within a search distance of that address. An alternate way to find an AADT is by using the Route Search option wherein the user selects the County, Road Name / Route Number. The AADT locations are plotted in Google Maps and the list is displayed in a results window. The search panels, maps and results are all components of the same window.

Internet Traffic Monitoring System (I-TMS)

The I-TMS provides access to detailed traffic count data. Similar to AADT Locator, I-TMS also has Address Search and Route Search options wherein the user can filter for the required locations. The tool then displays the locations in the results tab. The user can select an individual location to view reports (Class, Volume, etc.).

Traffic Volume Maps

This is a graphical representation of the Annual Average Daily Traffic (AADT) numbers displayed at each location on Maryland's road network. Traffic counts are reported as the number of vehicles expected to pass a given location on an average day of the year for all traffic-counting stations in the state. 

Truck Volume Maps

The Truck Volume Maps are graphical representations which depict the average percentages of trucks at various locations on Maryland s roadways by county. Also included at these locations is the current Annual Average Daily Traffic (AADT). 

Maryland's Traffic Trends

This tabular report summarizes data from the Automatic Traffic Recorders (ATRs) into factors used to convert a short-term count into an AADT number. The factors reflect day of week, monthly, and seasonal variations of traffic flow.

Traffic Station History (PDF, 650 kb)

This tabular report reflects the AADT in Maryland for the last seven years (2002 through 2009) and the Annual Average Weekday Daily Traffic (AAWDT) for 2009. The report lists the county, route, mile point, station ID, description, AADT and the AAWDT for each station.

Vehicle Classification by Functional Class (PDF,122kb)

This report reflects the percent of vehicle classifications by functional class for the years 1998 through 2008.

  If, you have questions or concerns please contact us at:

Maryland State Highway Administration
Traffic Monitoring System Team
707 North Calvert Street - MS C-607
Baltimore, Maryland 21202
Phone: (410) 545-5523
E-Mail: [email protected]



Traffic Trends uses the Crystal Reports viewer. In order to view these reports an ActiveX component must be installed on your computer. You will be asked if you would like to install it the first time you try to view one of the reports. Answer yes.

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Maryland Department of Transportation


707 North Calvert Street Baltimore, Maryland 21202