VISSIM 5.30-05 User Manual

5.6.1.2 The Decision Model
Managed Lane Facilities & Toll Pricing Models
The decision model calculates the number of vehicles actually using the
managed lane. For probability calculation, a Logit model is applied using the
following equation:
α * U
e
Managed
1
P(
Managed ) = 1 −
= 1 −
α * U
U
e
U
e
Managed α *
e
Unmanaged +
* Δ
+
1
α
Here, the utility difference results from the travel time difference (TT savings
= unmanaged TT - managed TT in [min]) and from the cost difference
(charges) between managed route and unmanaged route:
Δ Utility = CostCoefficient
* ΔCost
+ TimeCoefficient
* ΔTime
Enter the following parameters:
● Logit-Alpha (Default = 0.05)
● Utility-Coefficient Cost (optionally by vehicle class)
● Utility-Coefficient Time [min] (optionally by vehicle class)
For vehicles of a type that does not belong to any of the given classes the
default coefficients are used.
For vehicles of a type that belongs to several of the given classes the
values specified for the vehicle class with the lowest number the vehicle
type belongs to will be used.
User Manual © PTV AG 2011 155