Quality Assessment of the Dutch National and Regional Models



Quality Assessment of the Dutch National and Regional Models

Authors

R Smit, H Flikkeman, Centre for Transport and Navigation DVS, NL

Description

The paper discusses the realization and quality assessment of the National and Regional models in The Netherlands. The focus is on the development (and in some cases rejection) of new indicators to assess the quality and consistency of the models.

Abstract

The paper will discuss the realization of the latest generation strategic National and Regional transport models in The Netherlands. The focus of the paper will be on the way quality and consistency between the models was realized and subsequently monitored; what (new) indicators were developed, how did we generate and evaluate the indicators and what conclusions could be drawn about the quality of the models.
The 2009 ETC paper ?Development of the Dutch National and Regional models? describes the project in which the base matrices of the four regional models and the national model were realized using maximum consistency. This paper will focus on the quality assessment that was developed for the models. Both the quality of the individual models had to be determined as well as the consistency between the models. Also some innovations in the models led to the development of new indicators. Furthermore experiences in applications of the existing models led to new indicators that were to be analyzed.
A key novelty of the strategic models for the Netherlands is that de peak matrices contain all peak related traffic instead of the traffic during the time frames 7:00-9:00 and 16:00-18:00, using the concept of ?wish demand?. The assignment algorithm Qblok however distinguishes between the flow of the total peak (defined by the wish demand), and the flow during the 2-hr ?snapshot? between 7:00-9:00 and 16:00-18:00. Furthermore Qblok distinguishes between the links that are causing congestion, and the links that suffer from blocking back of the congestion. Related to these novelties new indicators were developed.
In the project of quality assessment a large set of new indicators is developed in addition to the existing/traditional set of indicators like trip length distribution and the way traffic counts are reproduced. The paper will explain what new indicators were developed (and in some cases rejected as not being relevant), and the process in which quality targets for the indicators were set.

Publisher

Association for European Transport