docs: public static Trajectory getTrajectoryByID(List<? extends Trajectory> t, int id){
  		Trajectory track = null;
  		for(int i = 0; i < t.size() ; i++){
  			if(t.get(i).getID()==id){
  				track = t.get(i);
  				break;
  			}
  		}
  		return track;
  	}