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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.


Traffic Data Collecting Information

The most recent roadside safety procedures and guidelines required by SHA for traffic counting. It also includes templates for traffic counting data for use by our 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.

GIS Traffic Count Data

Traffic data, including Annual Average Daily Traffic (AADT), Annual Average Weekday Daily Traffic (AAWDT) and Truck Percentages is available for download from our website as shapefile and Keyhole Markup Language (KML) files in NAD 83 Feet Harn.

Traffic Station History 895 KB,  3.4 MB

This tabular report reflects the AADT in Maryland for the last seven years (2012 through 2018). The report lists the county, route number, road name and location, as well as the beginning  and ending mile points of the section, or road represented, by the AADT.  It also includes the description of the road segment.

AADT, AAWDT & Truck Percentages  980 KB, 3.4 MB

This tabular report reflects the Annual Average Daily Traffic (AADT) , Annual Average Weekday Daily Traffic (AAWDT) & Truck Percentages for 2018 in Maryland. The report lists the county, route number, road name, location, begin mile point, end mile point of the section or road represented by the AADT and the description of the road segment.

Vehicle Classification by Functional Class  417 KB,  172 KB

This report reflects the percent of vehicle classifications by functional class for the years 1998 through 2014.

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: tms@sha.state.md.us



Traffic count data reports and data sets are provided as a public service by the Maryland State Highway Administration (SHA).

SHA makes no claims, promises or guarantees about the accuracy, completeness, or adequacy of the contents of these documents and expressly disclaims liability for any errors and omissions in the contents of these documents. All route, traffic, and travel data being made available by SHA are developed to support internal uses, primarily transportation planning. Any and all data are provided "as is" with the understanding that no warranty of any kind, implied, expressed or statutory, is given with respect to the contents of this document. Any and all conclusions or products derived from the data are the sole responsibility of the user.

Information presented in this document is considered public information and may be distributed or copied.