PROBIT TYPE TRIP ASSIGNMENT MODELS FOR UNCONGESTED SITUATIONS
NIET-CONGESTIE GEVOELIGE TOEDELINGSMETHODEN VAN HET PROBIT-MODEL TYPE
This report deals with so called probit-type trip assignment models for uncongested situations, giving special attention to stochastic simulation approaches for complete networks. This class of assignment model is compared with other assignment approaches for uncongested problems. A detailed description and critical analysis is given of the behavioural foundations of this model type using the random-utility discrete-choice theory as a starting point. An efficient performance of a probit model based trip assignment on a network scale is only feasible using a simulation approach. In this case the term stochastic assignment is used. The various aspects of the simulation approach (random number generating, randomization sequence, number of iterations, etc) are critically reviewed and basic procedures of performing the simulations are compared with each other. This analysis leads to suggestions with respect to the specification of the route-choice utility function as well as about the best simulation procedure. It is recommended that the stochastic assignment is performed in a recursive fashion as a series of all-or-nothing assignments on a randomized network keeping the number of iterations dependent on the required output accuracy. Formulae are presented with which the convergence and the output accuracy can be examined. The problem of parameter calibration are also tackled. Recommendations for the execution of stochastic trip assignments in planning practice are also provided.
TECHNISCHE UNIVERSITEIT DELFT, ONDERZOEKINSTITUUTBERLAGEWEG 1
- Bovy, P H L
- Publication Date: 1988
- Pagination: 129 p.
- Issue Number: 10
- TRT Terms: Calibration; Mathematical models; Methodology; Modal split; Physical distribution; Simulation; Stochastic processes; Traffic assignment; Travel
- Uncontrolled Terms: Selection
- Subject Areas: Data and Information Technology; Freight Transportation; Operations and Traffic Management;
- Accession Number: 00499333
- Record Type: Publication
- Source Agency: Institute for Road Safety Research, SWOV
- Files: ITRD, TRIS
- Created Date: Sep 30 1990 12:00AM