VISSIM 5.30-05 User Manual

Driving Behavior
● CC6 (Speed dependency of oscillation): Influence of distance on speed
oscillation while in following process. If set to 0 the speed oscillation is
independent of the distance to the preceding vehicle. Larger values lead
to a greater speed oscillation with increasing distance.
● CC7 (Oscillation acceleration): Actual acceleration during the oscillation
process.
● CC8 (Standstill acceleration): Desired acceleration when starting from
standstill (limited by maximum acceleration defined within the
acceleration curves)
● CC9 (Acceleration at 80 km/h): Desired acceleration at 80 km/h (limited
by maximum acceleration defined within the acceleration curves).
5.4.3 Lane Change
There are basically two kinds of lane changes in VISSIM:
► Necessary lane change
(in order to reach the next connector of a route)
► Free lane change
(because of more room / higher speed)
In case of a necessary lane change, the driving behavior parameters contain
the maximum acceptable deceleration for the vehicle and the trailing vehicle
on the new lane, depending on the distance to the emergency stop position
of the next connector of the route.
In case of a free lane change, VISSIM checks for the desired safety distance
of the trailing vehicle on the new lane. This safety distance depends on its
speed and the speed of the vehicle that wants to change to that lane. There
is currently no way for the user to change the "aggressiveness" for these
lane changes. However, changing the parameters for the desired safety
distance (which are used for the vehicle following behavior) will effect the
free lane changes as well.
In both cases, when a driver tries to change lanes, the first step is to find a
suitable time gap (headway) in the destination flow. The gap size is
dependent on the speed both of the lane changer and the vehicle that
“comes from behind” (on that lane the lane changer changes to). In case of a
necessary lane change it also depends on the deceleration values of the
“aggressiveness”.
User Manual © PTV AG 2011 133