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Traffic Volume Maps by County


The Traffic Volume Maps show the Annual Average Daily Traffic (AADT) numbers displayed at various locations on Maryland's roadways. 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. Traffic volume data is collected from more than 3,000 Program Count stations and 79 Automatic Traffic Recorders (ATRs) located throughout Maryland. Program Count data is collected for both directions at regular locations on a three-year cycle (one-third of these are counted each year). The other two-thirds are factored based on the past yearly growth of an associated ATR. Counters are placed for 48 hours on a Monday or Tuesday and are picked up that Thursday or Friday, respectively. The ATR and toll count data is collected on a continuous basis. The toll station data is provided by Maryland Transportation Authority.

Please see the Traffic Volume Map Introduction (PDF, 10kb) and ATR and Toll Locations (PDF, 12kb) for more information about the Traffic Volume Maps.

The entire 2009 Maryland Traffic Volume Map (10.5MB) is available as a PDF file. To view, download, or print PDF files, you must have Adobe Reader installed on your computer. If you already have Adobe Reader installed, click the previous link.

To download a free copy of Adobe Reader, click here.

Please Note: The PDF file size for the Traffic Volume Maps vary as such, the Traffic Volume Map that you select may take a few seconds or a few minutes to display fully, please be patient while the file downloads.

Maryland Map with Counties

View the Traffic Volume Maps by County Archive for the Years 1980 - 2008

The Traffic Volume Maps from previous years are available only as PDF files: Archive.

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Maryland Department of Transportation

707 North Calvert Street Baltimore, Maryland 21202