Transportation in New York City City and Fort Lee, New Jersey, is the world's busiest bridge in terms of vehicular traffic. New York has historically been a pioneer in tunnel construction. Most carry rail lines, but there are four exceptions. The Lincoln Tunnel, which carries 120,000 vehicles per day under the Hudson River between New Jersey and Manhattan, is the world's busiest vehicular tunnel. The Holland Tunnel, also under the Hudson River, was the first mechanically ventilated vehicular tunnel in the world and is considered a National Civil Engineering Landmark by the American Society of Civil Engineers. Two other notable tunnels connect Manhattan to other
Jersey City, New Jersey and 2010 substantially increased the number of housing units and that new populations may have been undercounted by as many as 30,000 residents based on the city's calculations. Preliminary findings indicated that 19,000 housing units went uncounted. As of the 2000 United States Census, the population was 240,055 making Jersey City the 72nd-most-populous city in the U.S. Among cities with a population higher than 100,000 ranked in the 2000 Census, Jersey City was the fourth most densely populated large city in the United States, behind New York City; Paterson, New Jersey; and San Francisco. There were 88,632 households, and 55,660