Hudson County, New Jersey, is the sixth most densely populated county in the U.S. and has one of America's highest percentages of public transportation use. During the 1980s and early 1990s, planners and government officials realized that alternative transportation systems needed to be put in place to relieve increasing congestion along the Hudson Waterfront, particularly in the vicinity of the Hudson River crossings. After extensive studies, it was decided that the most efficient and cost-effective system to meet the growing demands of the area would be a light rail system, constructed in several phases.