Reliability in Urban Public Transport Network Assessment and Design

This publication describes how public transport reliability has become a more and more important aspect for assessing the performance of public transport networks. Unreliability in public transport services leads to uncertainty and resulting delays aggravating inconveniences for public transport users. Moreover, it increases operating costs due to lower fleet and crew utilization. With respect to the importance of reliability, the question might be raised how the impacts of reliability might be accounted for in public transport network assessment and design? As a result, does considering reliability as an influential factor lead to extensions in public transport network assessment and design? Evaluating public transport networks is usually based on a deterministic point of view. All types of input are assumed to be known exactly and to be constant over time. These are clearly unrealistic assumptions since the demand pattern varies between hours and over days, while transport supply varies as well. In reality there are a large number of regular and irregular variations influencing public transport infrastructure availability and service operations. The question thus is how such stochasticity in supply and demand might be included in the public transport network assessment and thus how assessment feedbacks may influence public transport network design. The result of this research clearly shows that there are opportunities for improving service reliability and the overall network performance in public transport network design. In some situations shortening long service lines is recommended, although the demand pattern plays a major role. The main contribution may be expected from smart investments in infrastructure to increase service network flexibility. Examples include bypasses for vulnerable links, shortcuts between adjacent lines and turning facilities at strategic points. The analysis is developed in this framework and the tool is specifically tailored to select easily the most effective measures.

  • Availability:
  • Corporate Authors:

    Netherlands TRAIL Research School

    P.O. Box 5017
    Delft,   Netherlands  2600 GA
  • Authors:
    • Tahmasseby, Shahram
  • Publication Date: 2009


  • English

Media Info

  • Media Type: Print
  • Features: Figures; Maps; Photos; References; Tables;
  • Pagination: 230p

Subject/Index Terms

Filing Info

  • Accession Number: 01139714
  • Record Type: Publication
  • ISBN: 9789055841165
  • Report/Paper Numbers: T2009/6
  • Files: TRIS
  • Created Date: Sep 17 2009 9:48AM