CHART On The Web Welcome to the Maryland State Highway homepage. All About SHA, Programs & Regulations, On The Road, CHART, Employment Opportunities, Maps & Brochures, Information & Feedback, Doing Business, Projects & Events. CHART is a joint effort of the Maryland Department of Transportation, Maryland Transportation Authority and the Maryland State Police, in cooperation with other federal, state and local agencies. CHART's mission is to improve real-time operations of Maryland's highway system through teamwork and technology. actionchartcooperativehighwayhighwaysmarylandresponseroadteamtraffic with marylandstatehighwayhomepageshaprogramsregulationsroad