Final answer:
A standard passenger vehicle needs a minimum of 2 people to drive in the carpool (HOV) lane in most cases.
Step-by-step explanation:
In most cases, a standard passenger vehicle needs to have a minimum of 2 people in order to drive in the carpool (HOV) lane. However, the specific requirements may vary depending on the state or region. For example, some areas may require 3 or more people in the vehicle to use the carpool lane.