An Off-the-cuff way to get a person's interest, comparable to a whistle, is a hissing sound: "pssiu!" It's not necessarily perceived as impolite, but gets really annoying if repeated much too often. There won't be any regulations demanding truckers to consider necessary relaxation stops they usually usually generate for too https://wiki.multiflay.com/profile.php?user=jacquelyn-mcgill-146601&do=profile