The MDOT SHA Traffic Monitoring System (TMS) is a product of the ISTEA Act of 1991, which required a traffic data program to effectively and efficiently meet MDOT SHA's long-term traffic data monitoring and reporting requirements.Annual Average Daily Traffic (AADT) data is updated and published on an annual basis for the prior year. The data is essential in the planning, design and operation of the statewide road system and the development and implementation of State highway improvement and safety programs. Where "0" represents the current year when data was collected (in 2014), "1" represents the count taken in 2013, "2" represents the count taken in 2012, "3" represents the count taken in 2011 and so forth.Annual Average Daily Traffic (AADT) data is a strategic resource for the Federal Highway Administration (FHWA), the Maryland Department of Transportation (MDOT), the Maryland Department of Transportation State Highway Administration (MDOT SHA), as well as many other State and local government agencies.
The last digit represents the number of years prior to the actual count.
Mdot traffic count code#
A special numeric code was added to the AADT numbers, starting in 2006, to identify the years when the count was actually taken. Toll station data is provided by the Maryland Transportation Authority (MDTA). The ATR and toll count data is collected on a continuous basis. Counters are placed for 48 hours on a Monday or Tuesday and are picked up that Thursday or Friday, respectively. Growth Factors are applied to counts which were not taken during the current year and the counts are factored based on the past yearly growth of an associated ATR. Program count data is collected (both directions) at regular locations on either a three (3) year or six (6) year cycle depending on type of roadway.
To date, four (4) ATRs have been removed from the ATR Program. The quality control feature of the system allow data edit checks and validation for data from the 84 permanent, continuous automatic traffic recorders (ATRs) and short-term traffic counts. Esri ArcGIS Online (AGOL) Hosted Feature Layer for accessing the MDOT SHA Annual Average Daily Traffic (AADT) data product.MDOT SHA Annual Average Daily Traffic (AADT) data consists of linear & point geometric features which represent geographic locations & segments of roadway showing traffic volume throughout the State of Maryland.Annual Average Daily Traffic (AADT) data is collected from over 8700 program count stations and 84 ATRs, located throughout Maryland.
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