// get the node to build the elevator out from
IntersectionVertex sourceVertex = vertices.get(level);
String sourceVertexLabel = sourceVertex.getLabel();
String levelName = level.longName;
ElevatorOffboardVertex offboardVertex = new ElevatorOffboardVertex(graph,
sourceVertexLabel + "_offboard", sourceVertex.getX(),
sourceVertex.getY(), levelName);
new FreeEdge(sourceVertex, offboardVertex);
new FreeEdge(offboardVertex, sourceVertex);