VISSIM 5.30-05 User Manual

6 The Traffic Network
VISUM VISSIM
Signal controller and
signal groups
Signal group
assignment to lanes
in the junction editor
SCJ and signal groups
Signal group assignment to signal heads on lanes
Time interval Evaluation period for dynamic assignment
From the node
control type
For NEMA signal
controlled nodes
Signal heads, stop signs, conflict areas
Detectors
VISUM zone connectors
► It is recommended to have VISUM zone connectors only from/to nodes
that have only one (feeder) link to/from an adjacent node, and from that
node only to/from a single zone. In this case the parking lots (or vehicle
inputs and routing decisions) for these zone connectors can be placed on
the existing feeder link.
► If the zone connector is connected to a node with more than one link or if
more than one zone are connected to the same node each connector
must be modeled by an additional link in the VISSIM network which is
connected to the node’s links without any regard for the node geometry.
Reduced speed areas on VISSIM connectors
Reduced speed areas on VISSIM connectors are generated automatically if
the curvature of the turn exceeds a theshold. Therefore, the coordinates of
the adjacent links are regarded and the angle between points as well.
Normally, the automatically created reduced speed area is placed in the
middle of the connector and has a length of 2 m. Thus the starting position
x = connector length : 2 - 1m. In case of connector length < 2 m, the reduced
speed area covers the entire connector.
Speed is assigned as follows automatically:
► Inner turns (left-turns in case of right-hand traffic): 25 km/h
► Outer turns (right-turns in case of right-hand traffic): 15 km/h
The value range of the automatically generated desired speed distributions is
{-10%...10%}.
Since VISSIM 5.00-07, deceleration depends on the vehicle class. If the
vehicle class includes a vehicle type of category HGV or Bus or Train,
deceleration is set to 1.3ms 2 , otherwise deceleration is set to 2.0ms 2 (as
before).
172 VISSIM 5.30-05 © PTV AG 2011