as well as instances in which children independently access an unoccupied vehicle. 3. Occupant safety (a) Amendment (1) In general Chapter 323 of title 49, United States Code, is amended by adding after section 32304A the following new section: 32304B. Occupant safety (a) Definitions In this section: (1) Passenger motor vehicle The term passenger motor vehicle has the meaning given that term in section 32101. (2) Rear designated seating position The term rear designated seating position means all designated seating positions that are rearward of the front seat. (3) Secretary The term Secretary means the Secretary of Transportation. (b) Rulemaking Not later than 2 years after the date of the enactment of the Hot Cars Act of 2019 , the Secretary shall issue a final rule requiring all new passenger motor vehicles with a gross vehicle weight of 10,000 pounds or less to be equipped with a system to detect the presence of an occupant in a rear designated seating position after the vehicle engine or motor is deactivated and engage a warning. In developing the rule required under this subsection, the Secretary shall consider requiring systems that also detect the presence of any occupant unable to independently exit the vehicle as well as detect the presence of a child who has entered an unoccupied vehicle independently. (c) Means The alert required under subsection (b)— (1) shall include a distinct auditory and visual alert to notify individuals inside and outside of the vehicle of the presence of an occupant, which shall be combined with an interior haptic warning