each one will have some sand and effects with it... the idea for laguna seca was for a car to go off course at the corkscrew and smash into a wall and well... pretty much shatter on impact. for the desert it was going to be a race through a sand duney section and a car would flip ans crash from a sand dune so if your thinking rally track because of the sand and effects needed you'll have to think of the phisics for each now