* walk leg
*/
ArrivalAndDepartureInstance fromStopTimeInstance = arrival.getInstance();
StopEntry fromStop = fromStopTimeInstance.getStop();
DepartureVertex toStopVertex = (DepartureVertex) vTo;
StopEntry toStop = toStopVertex.getStop();
addTransferLegIfNeeded(state, fromStop, toStop, options, legs);
}
return builder;