摘要: |
High quality transit service requires two feedback loops. The first loop, which works in real time, is operational control: taking measures to restore service to schedule. The second loop, which works off-line over a longer time frame, is service planning: making a schedule that reflects realistic operating conditions, is achievable and allows for and expects interventions for operational control. At the heart of both quality loops is a performance monitoring system based on an on-board computer with location tracking capability. It communicates in real time its location and deviation from schedule; for service planning, it records its trajectory during the day and uploads it at night into a database used for service planning. This paper shows how service planning can be integrated with operational control using simple illustrations based on the systems that are in place in Eindhoven, Netherlands. The operational control systems used there are holding at time points, and conditional priority at signalized intersections. Late buses request, and are given, priority while early buses experience normal intersection delay, thus restoring service to its schedule. The analysis and planning system used is TRITAPT (TRIp Time Analysis in Public Transport), a program developed at the Delft University of Technology. |