VISSIM 5.30-05 User Manual

Non-Signalized Intersections
A vehicle on the minor road that has already entered a conflict area will
always try to leave it, even if this means entering another conflict area where
the gap condition is not met (anymore).
Conflict areas are created, deleted and edited in the Conflict Area mode.
6.6.2.2 Creating
Define area Left-click on a position where flows might conflict:
The two overlapping link segments are displayed in yellow with the links
outlined in yellow, too. This is referred to as a passive conflict area.
Define state Right-click once or several times to define an active conflict area:
Select the appropriate right of way configuration, displayed in the status line
and through link colors:
► Green = main road (right of way).
► Red = minor road (yield).
► Both red may be used for branching conflicts where vehicles need to
"see" each other but there is no right of way because vehicles simply
stay in their original sequence.
► Both yellow is passive.
6.6.2.3 Properties & Options
The attributes affect the calculation of the plan (acceleration profile) for each
vehicle approaching the conflict area. The resulting situations (especially the
resulting front and rear gaps between two vehicles) can be different from the
defined attributes. This is caused by the fact that a vehicle may change its
plan (and thus its current behavior) due to a change in the current traffic
situation.
Some of the attributes are relevant only for some conflict situations.
● Visibility: Maximum distance
from where an approaching
vehicle can see vehicles on
the other link. As long as a
vehicle on the minor road is
further away from the conflict
area it plans to stop in front of
the conflict area. Caution:
Values below 1 m can cause a
vehicle to stop forever
because it may not come
close enough to the conflict
area due to the driving
behavior settings.
The blue vehicle reached the point from
where it can fully see past the building.
Therefore visibility for link 2 is dL2.
User Manual © PTV AG 2011 273