VISSIM 5.30-05 User Manual

6 The Traffic Network
Editing
The Reduced speed areas mode needs to be active.
Select There are two ways to select a reduced speed area:
► Outside of the VISSIM network, right-click to call the Reduced speed
areas selection list: Select the reduced speed area by left-click and click
DELETE, ZOOM or DATA to continue.
► In the VISSIM network, left-click to select the link or connector. Select the
reduced speed area by another left-click.
Zoom In the Reduced speed areas list, click ZOOM for the selected reduced speed
area.
Edit data In the Reduced speed areas list, click DATA for the selected reduced speed
area.
In the network display, double-click the reduced speed area.
Delete In the Reduced speed areas list, click DELETE for the selected reduced speed
area.
In the network display, select the reduced speed area and click DEL or drag it
out of its link/connector while keeping the left mouse-key pressed.
6.3.3.2 Desired Speed Decisions
A desired speed decision is to be placed at a location where a permanent
speed change should become effective (i.e. change of desired speed). Each
vehicle gets a new speed from the relevant speed distribution as it crosses
over the desired speed decision. Only then it reacts to the new speed - either
by acceleration or deceleration according to the particular acceleration /
deceleration function.
The typical application is the location of a speed sign in reality. Other
applications include entries or exits of urban areas or narrow lane widths
(average speed drops).
For multi-lane links desired speed decisions need to be defined for each lane
separately. Thus different characteristics can be defined for each lane.
Definition
Prior to the definition of a desired speed decision at least one desired speed
distribution needs to be defined (cf. section 5.2.1).
1. Select the Desired speed decisions mode.
2. Select the link/connector where the desired speed decision should occur.
3. Right click at the location of the speed decision on the selected link (decision
point). The Create desired speed decision window opens.
4. For each vehicle class passing that link/connector select the appropriate
new speed distribution.
204 VISSIM 5.30-05 © PTV AG 2011