The hotel will usually provide 3-4 complimentary coupons. Additional day coupon can be purchased at a special rate of $16. What we would usually do is to check the number of participants that drive on that day itself. Suppose we are given 4 free coupons and 6 participants drive. We will purchase additional 2 coupons and share the $32 cost among the 6 participants. If you happen to be one of the only 3-4 participants that drive for that day, then there is no additional charge. Usually, we try to ask the hotel if they can provide additional free coupon if there happen to be more participants who drive on that day. But that is subjected to their approval.