input_routes.rou.xml

<routes>
   <vehicle id="left" depart="0">
         <route edges="beg beg2left left left2end end rend"/>
   </vehicle>
   <vehicle id="left_gap" depart="0">
         <route edges="beg beg2left left end rend"/>
   </vehicle>
   <vehicle id="middle" depart="0">
         <route edges="beg middle end rend"/>
   </vehicle>
   <vehicle id="middle_gap" depart="0">
         <route edges="beg middle rend"/>
   </vehicle>
</routes>