Public Transport

Sustainable traffic planning puts emphasis on the promotion of public transport. PTV Vissim aids traffic engineers in different sub-disciplines of public transport planning and offers them an extensive range of dedicated features and detailed modelling possibilities. Simulation of public transport is based on the flexible structure of public transport lines, both rail-based and road-based with different vehicle types, and the allocation of corresponding timetables and the line routes. Moreover, public transport networks created in PTV Visum can easily be imported via an interface and simulated in detail.

Multimodal simulation of a complex intersection with PTV Vissim (Mendelssohnplatz in Karlsruhe, Germany)

To determine the vehicle dwell times at stops, the software differentiates between three variable modelling types:

  • Distribution-based dwell time

In this method, the respective dwell time is based on a dwell time distribution. The user can define the wait time distribution as normal distribution or empirical distribution, based on compiled data.

  • Calculated dwell time

In this case the dwell time is calculated based on an average boarding and alighting time per passenger that can be defined by the user and the proportion of passengers boarding and alighting. The boarding and alighting process can be further specified by door-specific settings (boarding and alighting or boarding only or alighting only). The percentage distribution of boarding and alighting passengers per vehicle and stop, the demand-based time interval for the public transport line use and the allocation of passenger destinations, including their distribution over various public transport lines, can all be represented in PTV Vissim. Furthermore, PTV Vissim offers a wide selection of departure time options: to this end, public transport lines can depart according to a timetable, depending on their occupancy rate or in consideration of delays.

  • Simulated dwell time

The pedestrian module PTV Viswalk supports an even more detailed investigation. Both the capacity and the impact of the geometry of the stop design on passenger transfer times and on the overall traffic flow in private traffic and public transport can be assessed. The visual representation of pedestrians interacting with public transport lines within the stop geometry allows planners to quickly identify possible weak points in the processes of boarding and alighting and thus to derive planning-based improvements.

Public transport partial route diversion

A COM script or the add-on module VisVAP can be used by traffic engineers to test various scenarios for assigning public transport partial routes. For example, buses can be assigned to free bus bays or the transfer processes of passengers to public transport lines that run to different stops can be simulated.

Public transport priority schemes

A key component to increasing the appeal and cost-effectiveness of public transport is public transport acceleration. Measures for local public transport prioritisation can be applied at the operational and vehicle-based level. This includes, for example, the optimisation of passenger exchange by selecting the most suitable stop designs and especially measures related to links and intersections. The VAP and VisVAP modules allow users to simulate preferential handling of public transport vehicles at traffic signals by means of green waves or the setting up of special lanes in PTV Vissim.

Simulation of a partially signalized roundabout with spiral marking and tram prioritization.