Multi-modal and demand-responsive passenger transport systems: A modelling framework with embedded control systems

Multi-modal and demand-responsive passenger transport systems: A modelling framework with embedded control systems

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Article ID: iaor2003569
Country: United Kingdom
Volume: 36A
Issue: 2
Start Page Number: 167
End Page Number: 188
Publication Date: Feb 2002
Journal: Transportation Research. Part A, Policy and Practice
Authors:
Keywords: planning, vehicle routing & scheduling, control processes
Abstract:

The LITRES-2 modelling system provides a framework for investigating the performance of urban passenger transport systems, with particular attention to demand-responsive transport modes and traveller information technologies. The modes covered include conventional timetabled services (buses, trains etc.), taxis (both single- and multiple-hire), and other demand-responsive services. Tables of estimated aggregate demand are disaggregated so as to produce a stream of fully-articulated travel-requests. Individual requests are resolved as single- or multiple-leg journeys, through the use of request-broking and journey-planning modules that seek to minimise travellers' generalised costs. Journey-legs allocated to demand-responsive modes are handled by a fleet-scheduling module which includes provision for ‘instantaneous’ as well as advance-notice bookings, and for contingent situations such as breakdowns and passenger no-shows. The fleet-scheduling and journey-planning modules are designed as embedded control systems and are intended for use in real-time as well as modelling applications. The paper describes the main analytical and procedural components of LITRES-2, and assesses some methodological issues arising from experience in recent planning studies. The system appears to be well suited for use in modelling situations where the critical issues are concerned with the supply rather than demand side of transportation activity.

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