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CHAPTER 3 CAPTA Components Asset Categories CAPTA distills the modes and asset classes found in the transportation field to a manageable yet reasonably comprehensive number. Individual vehicles are not included as a separate asset class. Individual mobile assets are vulnerable to many threats and hazards, all of which have been well documented and analyzed. There are known conventional countermeasures that can be applied by owner-operators to increase the safety of a vehicle or the security of a rail car. Emerging technolo- gies that increase the safety and security of the individual vehicle continue to evolve. Assets and asset classes are aggregated into eight major asset categories: road bridges, road tun- nels, transit/rail bridges, transit/rail tunnels, transit/rail stations, administrative and support facilities, ferries, and fleets. Road Bridges Road bridges include any aerial structure designed to carry vehicular traffic across a body of water or land. This category is most effective when used to capture structures whose length spans greater than one beam. Structures that can not be readily replaced or repaired by existing agency maintenance personnel should be included. Road Tunnels Road tunnels include all bored, mined, or immersed tunnels that convey rubber tire vehicles, buses, and trucks. Road tunnels may be aggregated by length, although subaqueous tunnels should be named separately. Transit/Rail Bridges The transit/rail bridges category is intended to capture all raised aerial structures designed to carry rail rolling stock. The assumption is that a rail vehicle could not be readily rerouted around a stricken structure, and neither repair nor replacement could be readily achieved. Transit/Rail Tunnels A transit system with a major rail capability is likely to have an extensive network of tun- nels. Care should be given to collect the network into classes of tunnels for evaluation in CAPTA. Similarities in building type, length, or other characteristics should allow an aggregation. Subaqueous tunnels should always be named in CAPTA, not entered as part of a class. The expected unique characteristics and high cost of a subaqueous tunnel merit specific consideration in CAPTA. 23