lecture8

lecture8 - Transit Vehicle Scheduling Problem Description...

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11/24/03 1.224J/ESD.204J 1 Outline Transit Vehicle Scheduling: Problem Description Problem Characteristics Service Planning Hierarchy (revisited) Vehicle Scheduling
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11/24/03 1.224J/ESD.204J 2 Problem Characteristics Consolidated Operations (vs. Direct Operations) Passengers (vs freight) being moved Urban vs. intercity (short vs. long trip lengths) Relatively high service frequency (several trips per hour vs one trip per day) High temporal variation in demand within day Feasible speeds vary by time of day if vehicles affected by traffic congestion Operations/service plan is stable over a period of months Different type of competition May be a public agency or a private company Crew costs are significant fraction of total costs Routes have many nodes
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11/24/03 1.224J/ESD.204J 3 Temporal Variation in Vehicle Requirements and Vehicle Blocks 15:00 17:00 21:00 12:00 9:00 6:00 Time of day Vehicles 0 300 600 900 in service
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11/24/03 1.224J/ESD.204J 4 Input Function Output Demand characteristics Infrastructure Policies (e.g. coverage) Demand characteristics and pass loads) Route travel times Demand characteristics Policies (e.g. reliability) Route travel times Policies (e.g. reliability) Policies Network and Route Design Timetable Vehicle Scheduling Crew Scheduling time period Departure/Arrival times for individual trips on each route (per stop) Revenue and Non-revenue Activities Crew duties Service Planning Hierarchy Resources Resources Policies (e.g. headways Resources Resources Work rules and pay provisions Resources Frequency Setting Development Set of routes Service Frequency by route, day, and by Vehicle
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11/24/03 1.224J/ESD.204J 5 Infrequent Decisions both significant Methods Dominate Network Design Frequency Setting Timetable Development Vehicle Scheduling Crew Scheduling Cost Considerations Computer Dominates Decisions Dominate Methods Service Planning Hierarchy Service and Lost Considerations Incremental Analysis Frequent Optimization-Based
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11/24/03 1.224J/ESD.204J 6 Input: The timetable: each characterized by: -- starting point and time -- ending point and time between the end of a trip and the start of a (later) trip at the same location -- depot to trip starting points -- trip ending points to depot -- Vehicle Scheduling Problem a set of vehicle revenue trips to be operated, Possible layover/recovery arcs Possible deadhead arcs connecting: trip ending points to trips starting at a different point
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11/24/03 1.224J/ESD.204J 7 Observations: generate only plausible non-revenue arcs time Objective: activities for each vehicle) covering all trips so as to:
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lecture8 - Transit Vehicle Scheduling Problem Description...

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