One Less Car
- Maryland Campaign for Bicycling and Walking. Includes mission, accomplishments, products, application, and contact information.
- http://www.onelesscar.org/

Marylanders for a Second Crossing, Inc.
- The need for additional Potomac River crossings between Montgomery County and Virginia is apparent to anyone who needs to travel between these two areas. This group promotes a second bridge upriver from the Legion Bridge and below the Frederick County (Ma
- http://www.trafficstinks.org/