@Override
 public int compare(Visit a, Visit b) {
   return new CompareToBuilder()
       // TODO experiment with (aLatitude - bLatitude) % 10
       .append(a.getLocation().getLatitude(), b.getLocation().getLatitude())
       .append(a.getLocation().getLongitude(), b.getLocation().getLongitude())
       .append(a.getId(), b.getId())
       .toComparison();
 }
 @Override
 public double getNearbyDistance(Visit origin, Standstill destination) {
   long distance = origin.getDistanceTo(destination);
   // If arriving early also inflicts a cost (more than just not using the vehicle more), such as
   // the driver's wage, use this:
   //        if (origin instanceof TimeWindowedCustomer && destination instanceof
   // TimeWindowedCustomer) {
   //            distance += ((TimeWindowedCustomer)
   // origin).getTimeWindowGapTo((TimeWindowedCustomer) destination);
   //        }
   return distance;
 }