ArrayList eventIds = new ArrayList();
                ArrayList poiIds = new ArrayList();
                jsonFeed.put("trips", genTrip(vo, vehicle.getGraphicalSymbol(), eventIds, poiIds));

                if (eventIds.size() > 0) {
                    jsonFeed.put("proximity",
                                 LocationTools.findNearPoi(eventIds, poiIds, new ArrayList<Integer>(), new ArrayList<Integer>()));
                }