VISSIM 5.30-05 User Manual

5 Base Data for Simulation
► speed distribution 48-58 km/h,
► standard driving parameters except the values for both bx_add and
bx_mult which are shown on the x-axis (in this example bx_add equals
bx_mult -1),
► one time step per simulation second.
veh / h / lane
2400
2200
2000
1800
1600
1400
Saturation Flow
1200
2,00 2,25 2,50 2,75 3,00 3,25 3,50 3,75 4,00 4,25 4,50
bx_mult (=bx_add+1)
Wiedemann 99 Car Following Model
Scenario 74, 0% HGV
Scenario 74, 5% HGV
CC1 is the parameter which has a major influence on the safety distance and
thus affects the saturation flow rate. Apart from that the saturation flow rate is
also dependent on many other parameters, such as vehicle speed, truck
percentage, no. of lanes etc.
All the following scenarios are based on Wiedemann 99 car following model
with default parameters, except for the parameter CC1 which is shown on
the x-axis in the graphs below (one time step per simulation second).
The main properties of each scenario shown in the following graphs are:
Scenario Right-side rule Lanes Speed cars* Speed HGV* % HGV
99-1 no 2 80 n.a. 0%
99-2 no 2 80 85 15%
99-3 yes 2 80 n.a. 0%
99-4 yes 2 80 85 15%
99-5 yes 2** 120 n.a. 0%
99-6 yes 2 120 85 15%
144 VISSIM 5.30-05 © PTV AG 2011