title: How to limit the time vehicles are in scenario and make vehicles leave automatically?
body: <p>I'm implementing some attacks in veins and using Sumo I made a map and added all the 120(120 vehicles but during the simulation totally 30 vehicles must be in the map at the same time) vehicles I need, the problem is that all the vehicles are inserted but not departed at all. I want to have some sort of lifetime for vehicles and each stay for around 15 seconds. I would appreciate if someone help me with this problem.</p>
  <p>Bests</p>