Modelling the public transport capacity constraints’ impact on passenger path choices in transit assignment models
Journal Title: Archives of Transport - Year 2017, Vol 43, Issue 3
Abstract
The objective of this paper is to discuss the replication of passenger congestion (overcrowding) effects on output path choices in public transport assignment models. Based on a comprehensive literature review, the impact of passenger overcrowding effects was summarised in 3 main categories: the inclusion of physical capacity constraints (limits); the feedback effect between transport demand and supply performance; and the feedback effect on travel cost (discomfort penalty). Further on, sample case studies are presented, which prove that the inclusion of capacity constraints might significantly influence the assignment output and overall results in public transport projects’ assessment – yet most state-of-the-practice assignment models would either miss or neglect these overcrowding-induced phenomena. In a classical 4-step demand model, their impact on passengers’ travelling strategies is often limited to path (route) choice stage, while in reality they also have far-reaching implications for modal choices, temporal choices and long-term demand adaptation processes. This notion has been investigated in numerous research works, leading to different assignment approaches to account for impact of public transport capacity constraints – a simplified, implicit approach (implemented in macroscopic-based models, e.g. PTV VISUM), and a more complex, explicit approach (incorporated in mesoscopic-based models, e.g. BusMezzo). In the simulation part of this paper, sample tests performed on a small-scale network aim to provide a general comparison between these two approaches and arising differences in the assignment output. The implicit approach reveals some differences in assignment output once network capacity constraints are accounted for – though in a simplified manner, and producing somewhat ambiguous output (e.g. in higher congestion scenarios). The explicit approach provides a more accurate representation of overcrowding-induced phenomena - especially the evolving demand-supply interactions in the event of arising congestion in the public transport network. Further studies should involve tests on a city-scale, multimodal transport model, as well as empirical model validation, in order to fully assess the effectiveness of these distinct assignment approaches.<br/><br/>- The paper discusses the inclusion of overcrowding effects on path choices in public transport assignment models<br/><br/>- These can be grouped into 3 main categories: physical constraints, demand-supply feedback and path discomfort cost<br/><br/>- Sample case studies show that their inclusion may substantially affect the assignment output<br/><br/>- Two general methods of modelling capacity constraints are: the implicit and explicit approach<br/><br/>- An illustrative example shows that both approaches produce different output with the explicit one being more specific and adequate<br/><br/>
Authors and Affiliations
Arkadiusz Drabicki, Rafał Kucharski, Andrzej Szarata
Keywords
Related Articles
- EP ID EP220393
- DOI 10.5604/01.3001.0010.4224
- Views 310
- Downloads 0
Implementation of Gravity Model to Estimation of Transportation Market Shares
The theoretical consideration presented in the paper is inspired by market gravity models, as an interesting attitude towards operations research on a market. The transportation market issues are emphasized. The mathemat...
The assigment of vehicle assesment based on multi criteria decision making
The degree of emission limitation achieved through improved efficiency of combustion engine vehicles can no longer set off additional emissions caused by increasing traffic activity. As the restriction of greenhouse gas...
Heuristic algorithms applied to the problems of servicing actors in supply chains
The paper discusses main decision problems analysed in the subject matter of servicing actors operating in the supply chains, i.e. the vehicle routing problem, vehicles-to-task assignment problem and the problem of entit...
Models of maritime safety for development of navigation support systems
Navigation support systems are part of modern maritime transportation chain where larger and larger vessels are handled in ports. Support systems for sea navigation must meet certain criteria for access, integrity, accur...
Maintenance Strategy Maximising Availability Rate
Electronic equipment operates under various conditions. Due to characteristic nature of its applications (e.g. in transport), it should be highly reliable. Many years’ worth of observations show, those systems not only r...