Simulation/Variable Speed Signs
Variable Speed Signs (VSS)
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: <variableSpeedSign id="<VSS_ID>" lanes="<LANE_ID>[;<LANE_ID>]*" file="<DEF_FILE>"/>.
A file name must 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 ... <step time="<TIME>" speed="<SPEED>"/> </vss>
Each step is a combination of the time the next new speed shall be set and the speed to set itself.
A small example for usage of vss' within SUMO may be found in "data/examples/extended/variable_speed_signs".