invalid taxi ride

output includes internal edges which results in sumo error about "disconnected plan"
```
    <person id="ped162" type="ped_pedestrian" depart="170.88">
        <walk edges="-138624477#0"/>
        <ride from=":456813380_2" to=":456813380_2" lines="taxi"/>
        <walk edges="138624477#1"/>
        ...
    </person>
```
