Tolplan: Johannesburg Integrated Transport Model

 

Project title: Development of an integrated transport model for the city of Johannesburg

Contracting authority:
City of Johannesburg, Transport Department

Branch/sector: Public Authority
Contractor
: Tolplan

Project description:

The current South African Legislature now require metropolitan municipalities to update their integrated transport network strategies. The key focus areas being an update of the transportation information register (for both private vehicle transport, public transport and non-motorized transport facilities) and the updating of a transport model for the both the base year and several design years and land use scenarios.  In larger metropolitan municipalities the transportation model plays an important part of the planning process.  PTV Visum was the modelling software selected herewith.

The demand model was stratified by:

  • AM, Inter Peak and PM trips
  • Low, Medium and High income trips
  • Home or Work based origin of trips
  • Work, Education, Shopping and Other trip purposes

In total, there are 94 demand matrices (45 private vehicle matrices, 45 public transit matrices, 2 heavy vehicle movement matrices and 2 special case matrices) generated for the base year. Multiple linear regression and other method models were developed in PTV Visum to estimate Trip generation from a recent travel survey. Trip distribution functions parameters were estimated using PTV Visum’s calibre function to best suit the observed behavior in the travel survey, origin and destination surveys, GPS data and other sources. A stated preference survey was undertaken to estimate mode split coefficients also done within PTV Visum. The demand model was mostly based on the classic 4-step transportation model process, but some of the demand matrices were however estimated from agent based models (heavy vehicle GPS calibrated agent based model).

The route assignment methods include:

  • Dynamic User Equilibrium assignment for private vehicle transport.
  • Headway based public transport assignment with 1.886 transit lines. This assignment was proven to be very helpful because the largest part of the public transport in South Africa is unscheduled and large variances would be expected for transfers.
  • Non-motorized demand was calibrated.

Base year model statistics:

  • Nodes: 7.000
  • Links: 20.000
  • Turns: 60.000
  • Zones: 883
  • Main Zones: 24
  • Connectors: 2.500
  • Count locations: 3.084
  • Put stops: 5.000
  • Put lines: 1.900

 

Software & modules used: PTV Visum
Further information: Tolplan, www.tolplan.co.za


Tolplan Consulting (Pty) Ltd
www.tolplan.co.za

Johannesburg integrated transport model in PTV Visum, by Tolplan