public String getRosterNames() {
		
		if ((trip == null) || (trip.getRosterCount() == 0)) {
			return "<?>";
		}
		
		String r ="";
		
		for (int i = 0; i < trip.getRosterCount(); i++) {
			if (i > 0)
				r = r + ", ";
			r = r + trip.getRosterName(i);
		}
		return r;
	}