Visum provides the possibility to model junctions in detail. There are two major fields of application, namely the use of a detailed node impedance model among others in assignment procedures, and the export for a micro-simulation in Vissim.
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Element |
Description |
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Geometry |
Geometries are used to describe the geometry of nodes and main nodes in detail. The principal elements of geometries are legs. |
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Leg |
A leg geometry consists of a set of legs. A leg describes an entry to the node section and the corresponding exit. A set of legs at a node or main node is defined by the set of link orientations. |
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Lanes |
A leg consists of a set of incoming and outgoing lanes. Through lanes are the ones that lead right up to the adjacent node and pocket lanes start and end at a certain distance from the node area. |
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Lane turns |
Lane turns define a relation between an incoming lane and an outgoing lane. They are used for detailed transport system and lane-based descriptions of the turn conditions at a node. |
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Signal controller |
A signal controller describes the total of all signal control data at one or more nodes or main nodes. There are stage-based and signal group-based signal controllers, as well as external signal controllers of the type RBC. |
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Stage |
A stage is the basic unit of a signal plan in case of stage-based signal controllers. A set of signal groups is allocated to each stage. |
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Signal group |
A signal controller contains a set of signal groups, even if it is stage-based. Signal groups are used to describe the signalization in detail, with a lane turn-based approach. |
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Crosswalk |
Crosswalks serve to describe the pedestrian conditions at nodes and main nodes. They refer to legs. A leg can have several crosswalks depending on whether a center island or a channelized island has been defined. |
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Detector |
A detector is allocated to a node or a main node. This type of detector serves for modeling the signalization, for example, traffic-responsive signal control. |
