One of the trigger objects that may be specified within an additional-file allows the simulation of variable speed signs. The syntax for such an object is given in the following
Definition in a single file#
<additional>> <variableSpeedSign id="vss0" lanes="middle_0"> <step time="0" speed="2.8"/> <step time="100" speed="47.22"/> <step time="200" speed="-1"/> </variableSpeedSign> </additional>
The following attributes are used within the VariableSpeedSign element:
| Attribute Name | Value Type | Description |
|---|---|---|
| id | id (string) | The id of the Variable Speed Signal element (user choice) |
| lanes | id (string) | The id of the lanes of the simulation network |
| file | string | optional file in which the time and speed values are defined |
Each step-element is a combination of the time the next new speed shall be set
and the speed to set itself and uses the following attributes:
| Attribute Name | Value Type | Description |
|---|---|---|
| time | time (int) | Time in which the speed will be changed |
| speed | speed (double) | New speed (if no value or a negative value is given, the speed will be reset to the original network value) |
Definition with an external file#
Instead of defining the speed changes of a <variableSpeedSign> in the same file, it may also be read from a second file as follows:
<additional> <variableSpeedSign id="VSS_ID" lanes="LANE_IDS" file="DEF_FILE"> <step time="<TIME>" speed="<SPEED>"/> ... further entries ... </variableSpeedSign> </additional>
A file name can be supplied, called <DEF_FILE> within the schema above. This file must contain the information about when a certain speed shall be set onto the lane. This file has the following format:
<vss> <step time="<TIME>" speed="<SPEED>"/> <step time="<TIME>" speed="<SPEED>"/> ... further entries ... </vss>
Examples for variableSpeedSign definitions can be obtained from our test suites