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Transport Futures Limited
7 Glen Road, Kelburn
Wellington 6012
New Zealand

Mobile: 021 139 4438
Phone: 04 475 7730   


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Simplified Models

Simplified models

Simplified models are used to produce  ‘indicative’ forecasts and do not replace the need for conventional transport models.  Simplified models are needed when existing models are limited in terms of responsiveness, flexibility, speed or in cases where no conventional models are available.

Simplified models have the following characteristics:

  • Use of summarised data to represent the transport system.
  • Application of behavioural relationships and assumptions.
  • Provision of a rapid, flexible and cost effective resource.
  • Facilitation of tests beyond those possible using transport models.
  • Responses to changes in price, supply or behaviour.
  • Suitability for a broad range of policy and strategy option testing purposes

Model Types

  • Simplified demand: Simplified representation of selected aspects of the transport system, for example, TPM, STM, UDM, SRM and regression based spreadsheet models,
  • Structural models: High level relationship model, for example, UMOT and other scenario building models
  • Sketch models: High level simplified representation of conventional transport models, for example, START and other strategic transport models

Strategy Review Model

The SRM model is an example of a simplified demand model developed in New Zealand, and designed to test the likely impact of different combinations of changes to various factors, including:

  • Public transport service levels and fares
  • Private vehicle costs (including those related to road pricing and road building)
  • Fuel costs
  • Local strategies, such as: travel demand management, network management, intelligent transport systems and high occupancy vehicle strategies.

See separate SRM web page for further details and demonstration options.

Modelling > Simplified Models