Why when i spawn up the barstow drag it crashes my game with multiple cars on?

When i spawn up the barstow drag car with 4 cars on the map more or less 3 it will crash the game. (make it not respond and it will never respond) It does work in the garage and on big maps however it wont work with 3 cars allready spawned (being spawned first wont crash)

 

It is likely your computer unable to handle too many cars or you reaching the limit of cars your computer allows

 

i can spawn up like 6 cars (all rally cars) if they aint huge and it wont crash