When does it do that? Any mods installed?

as sson as i want to buy a car and sometimes i can freeroam and then it will aay street legal has stopped working and yes i do have but i bought the game and mods on steam on 20% off

Mods can/will make the game more unstable than it already is. There is no error handling possible in this game so when ANY error happens, its a flat out crash.

oh ok thanks for the help so will it help if i reinstall the game without mods

Yes it should, but before reinstalling it is important that you remove the remaining files in the game folder.

So for a clean game install do this:
uninstall game, remove remaining files, install game, verify files, and at last run the class remover.
Class remover is a feature of the Custom Workshop Installer, it helps to avoid some crashes.
Also note: do not verify files later, in case steam does it (apparently it happens if it can't find the game exe) and you had mods installed, then: uninstall mods, verify, run class remover.

As for mods: use only the Custom Workshop Installer, try mods one by one, also get my car dealer mod to avoid some crashes there when trying out car mods.

Edit:
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=2195001048

ok cool thanks for your help

@g13ba Where do I find the Class remover?

Here
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=1445498636