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Chapter 2: USFS Security-Related Vessel Characteristics 31 Table 2. Number of vessels in relatively high-risk passenger capacity categories by state. Vessel Passenger Capacity Total High-Risk State 500 to 1,999 2,000 or more Vessels Washington 15 9 24 New York 12 5 17 California 15 0 15 Massachusetts 13 0 13 Connecticut 6 0 6 Alaska 5 0 5 Texas 5 0 5 Delaware 5 0 5 Louisiana 4 0 4 Michigan 4 0 4 Ohio 4 0 4 Virginia 1 0 1 Maine 1 0 1 17%, respectively) of the 149 ferry vessels that have more than 100 gross tons are required to meet 33 CFR 104 requirements based solely on tonnage because their passenger capacity is less than 150. 2.4 Additional Categories That May Affect Security The following categories do not affect the applicability of federal security regulations. How- ever, they may be considered in vulnerability assessments and security plans developed for ves- sels under 33 CFR 104, for facilities under 33 CFR 105, and for areas under 33 CFR 103. 2.4.1 High-Ridership Systems As shown in Table 3, the first, third, and fourth systems with the highest ridership are in the New York City area and together represent one-third of all boardings at U.S. ferry systems. The ferry system with the second-to-highest ridership is located in the state of Washington. Ferry sys- tems with the fifth, sixth, and seventh highest ridership service the cities of Houston-Galveston, San Francisco, and Corpus ChristiPort Aransas, respectively. According to considerations of both annual ridership (Table 3) and capacity of largest vessels (Table 2), the New York City area and the state of Washington ferry systems are the highest-risk systems. 2.4.2 Vessel Vehicle Capacity Highway vehicle cargo in the USFS presents additional security concerns because vehicles con- tain a much greater volume to inspect and have the ability to carry and hide large amounts of explosives or other hazardous materials. As shown in Table 4, of the vessels in the National Ferry Database, 341 (50%) are passenger-only vessels. Three hundred and twenty-six vessels (48%) are roll-on/roll-off vessels with the ability to carry highway vehicles. Most roll-on/roll-off vessels also carry passengers. Only 10 of the 677 vessels in the National Ferry Database are railroad carfloats.