Public Transport Pack

The concept of chained trips in OmniTRANS

The Public Transport modelling class OtTransitconsiders each Public Transport trip as a chain of 'trip legs' made by different  modes; for example, walk - bus - walk; cycle-train- walk. By using this concept of chained trips,  access to and egress  from the PT system can be modelled explicitly for these different  user 'classes'

ZENITH assignment algorithm

The Public Transport assignment algorithm (called ZENITH)  was developed by Veitch Lister Consulting of Australia.  This considers multiple options for a single trip, allowing a distribution of trips over a range of competing public transport routes and modes. Further, the algorithm can take into account any traffic congestion that may influence access and egress options and the effect of congestion on (bus) services operating on the highway.

Multiple access- and egress modes

The algorithm automatically finds access, transfer and egress paths, based on user defined criteria, such as allowed modes, minimum search radius for transit stops and the candidate number of transit stops to be found. This allows modelling of Park and Ride, Kiss and  Ride and Bike and Ride. This is done using the 'pure' network and no network coding 'trick's to accommodate these mode chains are necessary. Further, any facilities affecting mode or route choice can be included directly in the model as transit stop attributes.

Multi-route assignment

The model considers all feasible alternatives for each mode-chain and allocates trips to stops and services, in accordance with relative utility. This approach improves representation of dense public transport networks with many route options, competition between modes and companies, access to express services and provides a better indication of accessibility.

Fares

A wide range of fare schemes, including those based on distance, stage, zone, ring or stop can be defined in the model. Fare levels may also be defined for different market segments using dimensions or combinations. Parameters allow the specification of the generalised cost function used in the assignment process, giving control over traveller behaviour.

Output

An impressive array of results is available for analysis and visualisation purposes.

• Passenger loads and transfers en-route
• Filtering of loads for a selection of stops or services and for the period of interest
• Boarding and alighting distributions over stops per centroid and over centroids per stop
• Aggregated and disaggregated skims, such as access, in-vehicle, transfer and egress skims
• Selected link- and screenline-matrices
• Station-to-Station matrices
• Passenger distance travelled
• Revenues per transit line

Feature diagram

The Public Transport Pack gives access to the following features:

Requirement

This pack requires the presence of the Data Manager pack.