VISSIM 5.30-05 User Manual

Automobile Traffic
2. Select a link with a single left button mouse click.
3. Select the desired location for the direction decision point on the selected
link with a single right button mouse click. The Create Direction Decision
window appears.
Properties & Options
4. Select the desired
direction of this decision
point (Desired
Direction).
5. Select the class(es)
of vehicles to be
affected by the
direction decision
(Vehicle Classes).
6. Define the percentage
of vehicles to be
affected by the direction
decision (Rate).
Example: An input of 1.000 results in all vehicles of the selected type
being affected by the direction decision, while an input of 0.100 only
affects 10% of the vehicles.
7. In addition, a time period can be specified for which the direction decision
is to be effective.
8. Having completed the parameter settings, click OK. The location of the
direction decision point will be indicated on the link. The appearance of
the direction decision will be one of the following:
Symbol Meaning
Blue arrow Direction decision to the right or left (effective at the next
connector specified as ‘right’ or ‘left’)
Blue line Annihilation of all effective direction decisions
Green arrow Direction decision to change lanes
Green line Direction decision to stay in the current lane
Example
DIRECTION DECISION LEFT AT 600 M RATE 30 %;
DIRECTION DECISION RIGHT AT 601 M RATE 20 %.
As a result of these two direction decisions, 20% of the vehicles will turn right
at the next intersection, 24% will turn left and 56% will continue through the
intersection. This is because 30% have been originally assigned with a left
turn decision, then 20% of all vehicles (including those which have already a
User Manual © PTV AG 2011 241