Keep all bids out in the open. Bids that are not apparent may be missed and once the auctioneer says sold the auction for that item is over and you will miss the oppertunity to purchase the vehicle. Raise your hand or yell if you are not seen to make sure you are not missed. This is important to keep the sale moving along and to help the auctioneer and staff so they do not miss your bids on the vehicles.