VISSIM 5.30-05 User Manual

6 The Traffic Network
6.4 Automobile Traffic
In VISSIM there are basically two methods to model automobile routing
information:
► Static routes using routing decisions (or direction decisions): With static
routes the path of vehicles traveling through the VISSIM network can be
statically determined either by routing decisions (section 6.4.4) or
direction decisions (section 6.4.5.4). However, it is strongly
recommended to use routing decisions since routes are much easier to
handle and the vehicle inputs can be defined more precisely.
► Dynamic Assignment using OD matrices (“Dynamic Assignment” add-on
required): The use of Dynamic Assignment is explained in detail in
chapter 12. For Dynamic Assignments, neither static routes nor inputs
need to be defined.
6.4.1 Vehicle Compositions
Vehicle compositions represent the mix of vehicle types and have to be
defined prior to the input flow definition. Please note that vehicles of PT
routes must not be included here but are to be defined separately (cf. section
6.5).
A vehicle composition consists of a list of one or more vehicle types. To each
of these vehicle types, a flow percentage and a speed distribution are
assigned. Both vehicle compositions and pedestrian flows can be defined as
traffic compositions.
Also pedestrian flows can be defined as a vehicle composition, but should
preferrably be defined as a pedestrian composition. The pedestrians as
vehicle compositions are bound to links and follow the Wiedemann model (cf.
section 5.4.1).
6.4.1.1 Creating & Editing
Vehicle compositions can be defined via TRAFFIC - VEHICLE COMPOSITIONS...
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