SUTRA : Sustainable Urban Transportation for the City of Tomorrow
WP 03: Multi-modal Transportation Modelling
D03.2 Transportation Model Prototype
First Draft
Karlsruhe, January 2002
/ PTV
Planung Transport
Verkehr AG
Preliminary Report
SUTRA : Sustainable Urban Transportation for the City of Tomorrow
WP 03: Multi-modal Transportation Modelling
D03.2 Transportation Model Prototype
First Draft
Prepared for:
Commission of the European Communities
Research Directorate-General
Prepared by:
PTV Planung Transport Verkehr AG
Author:
Josef Janko
Karlsruhe, January 2002
/ PTV
Planung Transport
Verkehr AG
Executive Summary
Executive Summary
The Traffic Assignment software package VISUM has been enhanced with modules to allow the modelling of particular scenarios of sustainable transportation, namely Park+Ride, High Occupancy Vehicles, and Road User Charging. Detailed descriptions can be found in the Implementation Report, Deliverable D03.1, and in the User Manual, Deliverable D03.3. The new methods and modules are available to the project partners.
While the effects of road user charging can be modelled with a special assignment procedure integrated in the software, other enhancements are partially external expansions of the model functions.
The Park+Ride module consists of a set of rules and procedures which have to be applied to the network data and the demand matrices in order to model this combination of transport modes. The approach can be set up flexible, depending on the availability of data describing the behaviour of potential P+R clients.
The treatment of High Occupancy Vehicles is similar to that of Park+Ride with the two differences that the demand shift remains within the private transport sector, and that different modifications in the network are necessary.
The data structures of the transport models have been adapted to enable data exchange in both directions between the transport model and the emission model TREM as well as post-processing of emission data through the transport model.
Data exchange with the other models is guaranteed by the standard VISUM output functions in the form of text files or through the Windows clipboard.
Park+Ride – An Example
A P+R site is defined by a transport model zone of its own. It is connected with the networks of private and public transport by separate connectors. P+R demand has to be split into a private transport and a public transport leg.
Figure 1 :Transport model elements of a P+R facility
P+R LPark+Ride Link
PuT SPublic Transport Stop
PuT CPublic Transport Connector
PrT C1Private Transport Connector
PrT C2Private Transport Connectors between the P+R zone and the destinations (in the city centre) for the determination of P+R potential
In a first stage an assignment is made without modelling P+R trips.
Figure 2 :Original Flows and Passenger Figures without P+R traffic
Displayed are the Park+Ride facilities, the road network (black), railway connections (magenta) and LRT lines (cyan). The private transport vehicle flows are coloured in red, the public transport passenger figures in blue.
In a second stage an assignment determines the potential maximum of P+R clients. These are all trips in private transport, which might have an advantage from using the P+R facilities.
Figure 3 :Potential Vehicle Flow Changes caused by P+R
(direction to the city centre only
This figure displays only the one direction of the trips, which is important for the choice situation of the travellers. Dark red are flow increases, light red flow reductions.
This potential demand between the P+R sites and the city centre has to be reduced to actual figures. This can be done based on survey data or through the application of utility models.
Following the determination of the actual P+R demand a final assignment run is necessary to obtain the actual flows in private transport and passenger figures in public transport.
Figure 4:Actual Flows and Passenger Figures with P+R Modelling
A more detailed figure of the volume changes shows the effects of the individual P+R facilities.
Figure 5:Changes in the Flows and Passenger Figures through P+R
Private transport flows are given in red (dark: growing – light: reduced), passenger figures are given in blue (dark:reduced – light: increasing).
PTV AG 01/02 / page 1/8