Question, why not just tell me that it cant be disabled and that there is a mod that lets you have that feature? Instead of making me believe that Assigning them their cars would stop the car pool? Either you. I also saw that you posted on that exact same forum about your mod that lets you disable the car pool feature.

Well after an hour of wondering what the heck is going on and why your advice clearly didnt work, i did some research online and I found another forum that says that you are UNABLE to disable the car pool. After I do that in my game, no more carpool! If you do it in the morning tho, sometimes the carpool will still show up that day, but not after that. Do the same for any other sims in the household with a car (or bike or moped for that matter). Select a sim and then click on the car you want to be 'their' car and then select 'Make Preferred Vehicle'.