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25 Table 2. Airport APM performance measures. and dwell to carry out the passenger exchange, with a station being the general locale at which passengers can board and AIRPORT APM PERFORMANCE MEASURES alight APM trains, regardless of the configuration or number Service Availability (one of three approaches to be selected) Safety Incidents per 1,000 Vehicle Service Miles of platforms at the station. For example, a station with two O&M Expense per Vehicle Service Mile side platforms separated by a dual-lane guideway is counted Actual and Scheduled Capacity (Peak Versus All Other) as one station. Passenger Satisfaction Missed Stations per 1,000 Station Stops Unintended Stops per 1,000 Interstations 5.1.6 Vehicles in Total Fleet Vehicles in Total Fleet is defined as the number of vehicles period of the day that maximum service is provided during the in the system that are either currently operable or capable of reporting period, with a route being the unique path a train being operable once the appropriate maintenance, cleaning, follows and station stops a train makes from its terminal of or other action has been undertaken. For the purpose of this departure to its terminal of arrival before changing directions system characteristic, "vehicle" is defined and distinguished (or in the case of single- or dual-lane loop systems, before as follows: beginning the same route again). For example, the Routes Operated in Maximum Service for a dual-lane pinched-loop Car. An individual passenger-carrying unit that cannot system would typically be two; for a dual-lane shuttle system, operate individually but must be connected and share four; for a dual-lane loop system, two; and so on. equipment with other cars to form a vehicle. A car is not Routes Operated in Maximum Service excludes routes a vehicle. implemented to address atypical, failure, or special-event Vehicle. The smallest passenger carrying unit that can operate service during the reporting period. individually. This may be a single unit or a permanently coupled set of dependent cars. A vehicle can also be coupled 5.1.4 Trip Time in Maximum Service with one or more other vehicles to form a train. Train. A set of one or more system vehicles coupled together Trip Time in Maximum Service is defined as the trip time and operated as a single unit. in the system, by route, during the peak period of the day that maximum service is provided during the reporting period, Vehicles in Total Fleet does not include heavily damaged beginning upon the start of the door closing sequence at the vehicles in need of extensive repair, decommissioned vehicles originating terminal and ending once all doors are open at awaiting disposal, and other similar permanently blocked-up the destination terminal (or in the case of single- or dual-lane vehicles that would require major repair or refurbishment loop systems, ending once all doors are open at the originat- efforts. ing terminal). This system characteristic includes interstation travel times and dwell times at intermediate stations and excludes dwell 5.2Service Descriptive Characteristics times at the origin and destination terminals as well as atypi- cal and failure-related events and operations, such as wayside Service descriptive characteristics of airport APM systems speed restrictions and onboard vehicle speed limitations. are descriptors that provide a general understanding of the service and operational aspects of airport APM systems and help put into perspective the performance measures of such 5.1.5Stations systems when they are used to compare performance among The Stations system characteristic is defined as the num- other airport APM systems. Service descriptive character- ber of stations in the APM system at which APM trains stop istics are likely to change from one reporting period to the Table 3. Airport APM system and service descriptive characteristics. SYSTEM DESCRIPTIVE SERVICE DESCRIPTIVE CHARACTERISTICS CHARACTERISTICS Single Lane Feet of Guideway, Mainline Passenger Trips Single Lane Feet of Guideway, Other Vehicle Service Miles Routes Operated in Maximum Service Vehicles Operated in Maximum Service Trip Time in Maximum Service Vehicles Available for Maximum Service Stations Headway in Maximum Service Vehicles in Total Fleet