This is just a proof of concept.
Since Snowcar i tried to find a way to have a differnt car each lap you drive. I found out that both cars have differnt Height and Width so with the Snowcar you are able to drive the left way but not the right and other way around. ( this is by far not the perfect setup but it works ! )
PS. Nadeo please create an automatic car change from Snowcar --> Car, Car --> Snowcar