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24 Chapter 5 Performance Measures for APM Systems at Airports: Recommended Approach Performance measures for APM systems at airports are 5.1.1Single Lane Feet of Guideway, Mainline organized into a set of seven metrics (shown in Table 2) Single Lane Feet of Guideway, Mainline is defined as the total and are reported along with system and service descriptive length of track in the passenger-carrying portion of the system, characteristics (shown in Table 3) at monthly intervals on regardless of direction, and is expressed in single lane (track) Form A and Form B, which are provided in Exhibit A. The feet. For example, if a system contains one mile of dual-lane measures are developed from the passengers' perspective and mainline guideway, this would be expressed as 10,560 single- therefore generally do not exclude events typically excused lane feet (slf) of mainline guideway (5,280 ft/mile 2 lanes). (1) under force majeure contract clauses or (2) when outside This system characteristic does not include guideway in the control of the system operator. the non-passenger-carrying portion of the system, such as This section provides the definition, data requirements, mainline pocket tracks, storage tracks beyond terminals, data sources, and data collection techniques for the airport turnback/switchback tracks, and yard tracks. APM performance measures, and begins with the definition Single Lane Feet of Guideway, Mainline plus Single Lane of the system and service descriptive characteristics that are Feet of Guideway, Other is the quantification of all track in critical to providing context to the performance measures the system. when the measures are used for comparison purposes among reporting airport APM systems. 5.1.2 Single Lane Feet of Guideway, Other 5.1System Descriptive Single Lane Feet of Guideway, Other is defined as the total Characteristics length of track in the non-passenger-carrying portion of the system, regardless of direction, and is expressed in single lane System descriptive characteristics of airport APM systems (track) feet. are descriptors that provide a general understanding of air- This system characteristic includes all guideway used in the port APM system size and help put into perspective the per- non-passenger-carrying portion of the system, such as main- formance measures of such systems when they are used to line pocket tracks, storage tracks beyond terminal stations, compare performance among other airport APM systems. turnback/switchback tracks, yard maintenance and storage System descriptive characteristics are likely to remain the tracks, and related shop approach tracks. Single Lane Feet of same from one reporting period to the next unless a system Guideway, Other also includes track lengths located indoors expansion or reduction has taken place since the last report- in the non-passenger-carrying portion of the system, such as ing period. The following system descriptive characteristics, vehicle storage and/or maintenance shop tracks. to be reported on Form A, are defined in this section: Single Lane Feet of Guideway, Other plus Single Lane Feet of Guideway, Mainline is the quantification of all track in the Single Lane Feet of Guideway, Mainline system. Single Lane Feet of Guideway, Other Routes Operated in Maximum Service 5.1.3 Routes Operated in Maximum Service Trip Time in Maximum Service Stations Routes Operated in Maximum Service is defined as the Vehicles in Total Fleet number of routes operated in the system during the peak