Ministry of Transport and Public Works

Evaluation of the Delft Bicycle Network Plan

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RESULTS AND CONCLUSIONS OF THE STUDY PARTS - Overview of the individual studies

The entire evaluation study into the plan's effects consists of a number of study parts which were carried out more- or-less independently:

1. Analysis of changes in mobility of Delft inhabitants with emphasis on mode-choice and the mode-choice situation. This investigation is based on home interviews and in-depth interviews. It was carried out by the Institute of Applied Sociology (ITS) at Nijmegen University.
2. Analysis of changes in the origin-destination pattern of bicycle trips. This investigation was based on mail back roadside surveys among cyclists. It was carried out by the Traffic and Transport Group of TNO (VVG-TNO) in Delft.
3. Analysis of changes in cyclists' route choice and network use. This analysis is based on observations of routes followed by cyclists in the Delft network. This investigation has been done by the Research Institute of Urban Planning and Architecture at Delft University of Technology (OSPA-TU Delft).
4. Analysis of changes in car and bicycle traffic volumes. This investigation compares counts held during the before and the after study. It was performed by the Stichting voor Hobiliteits- en Transportresearch in Delft (SHT).
5. Analysis of changes in traffic safety. This analysis uses traffic accident data of the period 1980-1988 as recorded in a centralized manner by Dutch Government. The investigation is being carried out by OSPA- TU Delft and will be completed in 1988.
6. Analysis of the effects of the newly built Plantage Bridge. Two separate evaluations of this project have been made. The first one, carried out by ITS, deals with the effects on the travel pattern of inhabitants of an adjacent residential district. The second investigation, by OSPA-TU Delft, determines the effects on bicycle traffic crossing the canal.
7. Analysis of the effects of the Station Tunnel on bicycle traffic and train use. This investigation by OSPA-TU Delft will be completed in 1988.
8. Comparison of the Delft travel pattern with that of other Dutch medium-sized towns. The objective of this study is to determine whether the findings of the evaluation study are transferable to other towns. It is carried out by OSPA- TU Delft, using existing data (National Mobility Survey, Survey on Labour Force).

To a certain extent these investigations are linked through the common use of observations and data. All investigations, except h., were before-and-after studies.

In this report only the investigations mentioned at a. through d. are dealt with.

Table 1: Overview of investigations