A transport supply system has diverse impacts which may vary because of measures (for example the construction of a new tram line or a bypass).
- Impacts on the user of the transport system
- Impacts on the operators who have to ”produce” a transport service
- Impacts on the general public who benefits from the transport infrastructure but also has to pay for it
- Impacts on the PuT contractor which may have to account for a political deficit
- Impacts on the environment which is harmed by pollution
Transport supply-side users
Users of infrastructure for private transport are mostly car drivers and their passengers, but also non-motorized travelers such as cyclists and pedestrians. Users of public transport are public transport passengers.
Transport supply-side operators
The road network is usually operated by the state, federal states or communities and increasingly by private investors. These operators of the road network have to decide on investments for the construction and maintenance of road infrastructure. PuT operators are the transport companies and transportation agencies. In the broader sense, the PuT contractors also belong to the operators. To offer public transport service, PuT operators develop line networks and timetables from which the user can then choose connections. To organize drivers and vehicles, PuT operators develop vehicle employment plans and rosters.
Models to calculate the impact of traffic
Visum includes different models which are used to determine the impacts of given transport supply.
- Different assignment procedures make it possible to assign current or anticipated travel demand to existing or planned transport supply. The most important information of these assignment procedures are network object volumes (link volumes for example).
- The connection quality of each transport systems or for the selected demand segments is described via skims, which can be output in skim matrices (impedance matrices).
- The environmental model makes it possible to determine noise and/or pollution emissions of motorized private transport for traffic volumes in the existing or planned transport network.
- An operator model determines the operational and financial requirements of PuT supply, projection of data to analysis period or analysis horizon, as applicable, is possible. The number of required vehicles is computed by a line-blocking calculation procedure, which are necessary to be able to offer the PuT supply.
