vehicles auto repair at your chosing intervals. and can auto replace at your chosen intervals.
its a matter of if your personal economy can support it or not.
they dont even need to be online.
it kinda forces people to not spam buy to many vehicles to quickly when they arent eearning enough to support said vehicles.
its more of a settings for making the game harder for advanced players.
every vehicle you buy should be watched a year later to see if they are earning enough to validate their existance.
and drop off and pick up locations need to be watched as well to see if you have to many or not enough vehicles.
its a micromanagment game. because vehicle count =/= success. its all about how you use them