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78 12.4 Managing an Instrumented Partly to avoid the complications of shifting instrumented Sub-fleet buses around, Tri-Met is well on its way to equipping its entire fleet with APCs. With 65% of the fleet instrumented with Where APCs are used, common practice is to equip only APCs (and the entire fleet instrumented with AVL), Tri-Met 10% to 15% of the fleet. The logistical issues of managing an simply allows the APC-instrumented buses to collect data equipped sub-fleet are significant. A program manager is wherever they get assigned; that gives it an adequate sample needed to make assignments of instrumented buses and to size. When APCs can be integrated into a smart bus system check whether assignments were made. Garage supervisors that already includes AVL and schedule matching, the mar- must stage the instrumented buses properly, and transporta- ginal cost of adding APCs drops dramatically. tion supervisors must ensure they are used where assigned. Data collection efforts that require all the buses operating on 12.5 Avoiding Labor Opposition a route or along a trunk be instrumented at the same time (e.g., for a headway analysis) are particularly demanding; if a Suspicion of "the spy in the cab" or "big brother" is natu- few instrumented buses miss their assignments, the data col- ral. There is always the danger of sabotage if transit operators lection effort will have to be repeated another day. Another resent the way a system monitors them, especially if they layer of complication is added if so many instrumented buses believe that the system is unfair or inaccurate. are needed in one place that intergarage transfers are needed. For the most part, transit agencies that have adopted AVL Aging of the equipped sub-fleet also poses problems. At and APCs have avoided incapacitating labor opposition. Gen- first, the instrumented buses are new, and there may be polit- erally, agencies have been successful at communicating the ical demands to assign the new buses in ways that conflict security benefits of AVL, which builds operator support. with a data collection program. As they age, restrictions on APCs generally do not engender opposition, perhaps because using them on certain routes or runs can develop. For exam- their name suggests they are only counting passengers. Some ple, they may not have the ergonomic seats needed by some agencies intentionally avoid directly challenging an operator operators, or the low floor required on some routes. They may with AVL-APC data. However, some use the data to identify develop maintenance problems with wheelchair lifts or other patterns of abuse or poor performance, alerting supervisors bus systems. where and when problems are likely to occur.