Carpool

The carpool comes whenever a Sim goes to work. (For children and teens, the school bus serves as the carpool.) In The Sims 2 and The Sims 3, the carpool has a visible driver, but it is nearly impossible to play this Sim. The carpool is scheduled to arrive an hour before the Sim's workday begins, though it may arrive a bit after the top of the hour. It will sit at the curb, beeping its horn, for an hour, and will then leave, even if the Sim hasn't gotten in. The Sim will usually autonomously start to head for the carpool shortly after it arrives, though in some cases, the player will need to cancel whatever action the Sim is performing. The player can cancel the Go to Work/Go to School action in order to let the Sim do something else, such as use the toilet, take a quick shower, or watch TV a little longer. However, the player will then have to click on the carpool or school bus and select Go to Work or Go to School in order to send the Sim to work or school. Of course, the player can choose to let the Sim miss the carpool or school bus and stay home. (In The Sims, this is the only way a Sim can get a day off from work or school.)

If The Sims 2: Nightlife is installed, the carpool will not come for a Sim who has been made the owner of a car.

Carpool Vehicles
In general, the carpool for a low-level career (level 1-3) will be a junky car. In The Sims, this is a very dirty car that appears to be from the late 1950s or early 1960s. In The Sims 2, it's a somewhat beat-up Smoogo Minima.

Carpool Vehicles in The Sims 3
Low level career (level 1-3): Sloppy Jalopy and Big Lemon (except in music career level 3, they use Wornado Triage).

Medium level career (level 4-7): Wornado Triage, 4-Everything Van, Yomoshoto Evasion, Tofunda Wagon.

High level career (level 8-10): VFN Kompensator, Bwan Speedster YL, Limousine* (*only for level 10 Business, Criminal, and Music Career).

Level 6-9 music career (rock branch) use tour bus as carpool.