You can monitor the vehicles you have bid on via the "Your bids" page. Every time you bid on a vehicle it is automatically transferred to this list. This allows you to monitor the vehicles you have bid on, and to continue to make further bids if someone else outbids you. There is a link to "Your bids" on the auction catalogue. If a bid is made during the last minute of the auction, the auction will be extended by 20 seconds. This ensures that you have an extra 20 seconds to place another bid, if you are out bid in the closing seconds of the auction.