In Utah, a car can legally carry as many passengers as there are factory-installed seatbelts.
Over here you can carry as many passengers as the car is designed to carry.
You can only carry the amount of passengers the car was designed to carry. In other words, if the car was designed as a four passenger vehicle, you cannot put six people into it.
Only if the instructing licensed driver is also in the car at the same time.
You can carry as many passengers as your car is designed for.
You are allowed the same number of passengers as there are seat belt sets. If there are 5 seat belts in a car then 5 people is the maximum allowed, including the driver, by law in ANY state.
Best practices dictate that the number of passengers be limited to the number of working seat belts in the vehicle.
The largest trains carry about 1000 passengers. So, theoretically if the train stopped running and all the passengers had to drive themselves by car, the answer is up to 1000 cars.
As many passengers as there are seat belts.
As many as there are seats. Any more would probably be called driver negligence should you have an accident and render you liable for the costs.
$350
As many people as there are seat-belts for.