Ridership data includes both manually recorded passenger surveys from interviews in the vehicle and automatically recorded usage data from access controls in the vehicle or at the stop. This data forms an important basis for planning, as it represents the status quo.
Passenger interviews can only ever reflect a small sample of passengers. Usually the passenger’s route within the PuT line network is not described completely by interview data. This applies especially to passengers who have to transfer several times or those who need to walk for transfers. It is possible to request further information, such as the purpose of the journey.
Survey personnel usually count the passengers boarding the surveyed line at the boarding stop and ask for the following details of the trip:
- Boarding stop of passenger trip where passenger enters the survey line, which means where the passenger is interviewed by the survey personnel,
- Alighting stop of passenger trip where passenger will leave the survey line,
- Origin and destination of the passenger trip.
After reading passenger data from file, it has to be verified and completed, if necessary. The survey forms must also state the departure time at a stop on the survey line or the identification of the vehicle journey.
Electronic ticket data can be retrieved from the IT systems by the PuT operator. This data is extremely useful for a transport model. Access to stops or, depending on the system, also to vehicles is granted to the user by means of a chip card. When entering the system (check in), at least the location and time of the card used is stored. Leaving the system (check out) is also possible only with the card. Fares are determined later from the resulting relations and/or times. If the access control takes place in the vehicle, details of the line used or even the trip can be stored if necessary.
The sample of this collected data is very high compared with a temporary passenger survey. Efficient processing of these large volumes of data is necessary.
The collected data, whether from passenger surveys or from systems with access controls to transport systems or vehicles, can be processed by the PuT passenger survey module.
The Visum add-on Passenger onboard survey contains the following basic functions.
- Reading survey data
This procedure is optional. It reads the ridership data from an attribute file. Alternatively, these network objects can be read in from databases or network files, entered via COM or interactively.
Loading data from file and conversion of data sets into PuT paths (Using Visum: Loading ridership data).
- Checking the plausibility of survey data
Checking and completing the data sets against the existing timetable in the model. Plausible data sets generate a public transport path that has a bidirectional relation to the ridership data set (Plausibilization of ridership data).
- Direct assignment
Assignment of the data sets (calculating network volumes from path volumes), optionally OD matrices and skim matrices can be generated (Assignment of ridership data).
After direct assignment of the survey data, the full range of the Visum functionality for analysis and display of results is available, e.g. flow bundle display (Interactive analyses) or PuT operating indicators (PuT operating indicators).
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Note: In the directory C:\Users\Public\Documents\PTV Vision\PTV Visum 2025/Examples, you can find an example of use on this topic. |
