Like $GOLD739 posted above, you get a hand stamp if you want to go to your vehicle. There's no paying to get back in unless you don't get your hand stamped.
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I went to La Salle last weekend. If they have some new policy for leaving the grand stands I haven't heard about it. Last season you got a hand stamp for all races, specials included. If it's different this year, my apologies. I don't understand why they'd change it if that's the case.