// this could be handled by method overloading on Vertex
public boolean isWheelchairAccessible(Vertex v) {
if (v instanceof TransitStop) {
TransitStop ts = (TransitStop) v;
return ts.hasWheelchairEntrance();
} else if (v instanceof StreetLocation) {
StreetLocation sl = (StreetLocation) v;
return sl.isWheelchairAccessible();
}
return true;
}
