Maryland has great potential for TOD in existing and future transit station areas, yet challenges remain. Four rail transit systems and three proposed systems provide over 150 stations, with approximately 85,850 acres within a half-mile radius of the station areas. Of those, close to 15,000 acres surrounding existing stations are considered underused or vacant, likely offering opportunities for TOD. While we describe the general TOD potential and challenges for each transit corridor in the follow-up sections, TOD potential among different modes or stations varies widely and must be assessed on a case by case basis.