input_routes.rou.xml

<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/routes_file.xsd">
   <vehicle id="0" depart="10">
      <route edges="beg middle end rend"/>
   </vehicle>

   <vehicle id="1" depart="20">
      <route edges="beg middle end rend"/>
   </vehicle>

</routes>