The TRIBUT procedure

Taking road toll into consideration, a constant value of time is set in conventional procedures, which in principle can be used to convert the costs (toll) into time and the conventional monocriterial assignment procedures are directly applicable.

Compared to the conventional approach, TRIBUT uses a concurrent distributed time value. Accordingly, TRIBUT calculates in the route search as well as in the route choice with two separate criteria, namely with time and costs (bicriterion).

This method has been used for many years in France, for the evaluation of privately financed freeways with toll management. Compared to the conventional approach, it is characterized by a much more realistic price elasticity in the use of toll roads.

Road tolls are transport system-specific and can either be defined for a link or a link sequence. Using link sequences allows the modeling of non-linear toll systems.

Road toll modeling is an add-on that can basically be used with any equilibrium assignment procedure. Visum provides two extensions of this kind: TRIBUT Equilibrium (as an extension of the Equilibrium method) and TRIBUT Equilibrium_Lohse (as an extension of the Equilibrium_Lohse method).

 

Note: . In the directory C:\Users\Public\Documents\PTV Vision\PTV Visum 2021/Examples, you can find an example of use on this topic. The PrT Assignment Tribut example illustrates the use of different types of road tolls or toll systems in a transportation model.