The Maryland Department of Transportation State Highway Administration (MDOT SHA) Data Services Division (DSD) is responsible for
DSD serves the entire agency and provides highway information, mapping information, and TMS data to the State of Maryland, local governments, the public and the federal government. The Federal Highway Administration uses highway information from the road inventory database to apportion federal funding to the State of Maryland.
A summary of the traffic volume data collected throughout Maryland.
Mileage information inside a municipality.
Provides a method for uniquely identifying roadway locations (mile points) and to identify data elements that are most commonly requested.
A large selection of interactive Geospatial Information Systems (GIS) maps and data sets available from MDOT SHA.
Summarizes the mileage of the Baltimore Beltway, Capital Beltway and The Interstate system.
Annual Average Daily Traffic (AADT) on state roads.
Yearly mileage Reports for State, State toll, county, and municipal roadway systems. Key terms can be found here.
Travel estimates for each county by Functional Class.
Mileage by county on the SHA, Toll, County, and Municipal roadway systems for the years 1980 to the present.
The information in these documents are provided as a public service by the Maryland Department of Transportation State Highway Administration (MDOT SHA). MDOT 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 MDOT 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 these documents. Any and all conclusions or products derived from the data are the sole responsibility of the user. Information presented on this website is considered public information and may be distributed or copied.
707 North Calvert Street
Baltimore, Maryland 21202-3601
Main Business Line – 410-545-0300
Safety Campaigns – 1-800-323-6742
For emergencies, call MDOT SHA's Statewide Operations Center at 410-582-5650.
Frequently Asked Questions
Public Information Act