The impact of a ﬁnancial constraint on the spatial structure of public transport services
infrastructure - vehicle, mode - bus, operations - frequency, place - europe
Public transport, Lines structure Design, Financial constraint
Using a single line model, it has been shown recently that the presence of a stringent ﬁnancial constraint induces a less than optimal bus frequency and larger than optimal bus size. This occurs because the constraint induces a reduction of the importance of users’ costs (their time); in the extreme, users’ costs disappear from the design problem. In this paper we show that such a constraint also has an impact on the spatial structure of transit lines. This is done departing from the single line model using an illustrative urban network that could be served either with direct services (no transfers) or with corridors (transfers are needed). First, the optimal structure of lines is investigated along with frequencies and vehicle sizes when the full costs for users and operators are minimized (unconstrained case); the optimal lines structure is shown to depend upon the patronage level, the values of time and the cost of providing bus capacity. Then the same problem is solved for the extreme case of a stringent ﬁnancial constraint, in which case users’ costs have relatively little or no effect in determining the solution; in this case the preferred outcome would be direct services under all circumstances, with lower frequencies and larger bus sizes. The impact of the ﬁnancial constraint on the spatial structure of transit lines is shown to be caused by the reduction in cycle time under direct services; the introduction of users’ costs in the objective function makes waiting times reverse this result under some circumstances.
Permission to publish the abstract has been given by SpringerLink, copyright remains with them.
Jara-Díaz, S., Gschwender, A., & Ortega, M. (2014). The impact of a ﬁnancial constraint on the spatialstructure of public transport services. Transportation (2014) 41:21–36. DOI 10.1007/s11116-013-9461-x