VISSIM 5.30-05 User Manual

Non-Signalized Intersections
responding stop line (red bar) stops any approaching vehicle (similar as a
red signal).
The current gap time (during simulation) is determined every time step by
the time an approaching vehicle will require to reach the conflict marker
(green bar) - provided that it continues traveling at its current speed. A
vehicle located on the green bar is not considered by the current gap time. If
the current gap time is less than the entry (defined for the conflict marker) the
corresponding stop line (red bar) stops any approaching vehicle (similar as a
red signal).
Example
conflict marker
(headway = 10m)
(gap time = 3.0s)
stop line
conflict area
50 km/h
(~ 14 m/s)
10m
49m
The blue vehicle
traveling on the main
road at 50km/h (i.e.
~14m/s) is 49m upstream
of the conflict
marker. The current
gap time is 49m /
14m/s = 3.5s. Thus
the yellow vehicle
(on the minor road)
can still pass,
because the min.
gap time is set to
3.0s.
conflict marker
stop line
conflict area
User Manual © PTV AG 2011 259
10m
28m
The blue vehicle is
now only 28m away
from the conflict
marker. The current
gap time is 28m / 14
m/s = 2s. Because
the min. gap time is
set to 3.0s the
yellow vehicle must
stop.
conflict marker
stop line
conflict area
10m
The blue vehicle
has just passed the
conflict marker. The
current gap time is
0s because the
vehicle front has
already passed the
conflict marker. But
because the min.
headway is set to
10m the yellow
vehicle still needs to
wait until the conflict
area is cleared
completely.
In order for a vehicle not to stop at the stop line, the conditions of all
corresponding conflict markers need to be satisfied (logical “AND” condition).