Bi-County Transitway
- A proposed "Purple Line" high-capacity transportation link between Montgomery and Prince George's Counties. Provides photographs, links to proposals and studies, and FAQ.
- http://www.bi-countytransitway.com/

Marylanders for a Second Crossing
- Citizens group seeking to promote plan for a second crossing over the Potomac to allieviate chronic traffic congestion.
- http://secondcrossing.org/

Longmead United Against the ICC
- A grassroots organization opposed to construction of the Intercounty Connector through the community of Longmead Crossing.
- http://www.luaicc.org/

Dillon's Bus Service
- Bus charter and commuter services between Baltimore, Washington DC, Annapolis, and Bethesda. Company history, charter information, and commuter schedules.
- http://www.dillonbus.com/

Baltimore & Ohio Railroad Photo Tours
- Virtual photographic mile-by-mile tour of the Baltimore and Ohio, now CSX, Railroad routes in Maryland. Historical descriptions with each photo.
- http://www.trainweb.org/oldmainline/

Washington Metropolitan Area Transit Authority
- Metrorail and Metrobus transit services in Washington, DC, Maryland and Virginia communities.
- http://www.wmata.com/

BWI Airport
- The Baltimore Washington International Airport serves residents and travelers in the Baltimore/Washington Corridor. Includes flight status, directions and parking, customer service, ground transportation, and news.
- http://www.bwiairport.com/