The size of the bag must not exceed 100 x 60 x 30 cm, and it must not occupy a seat for another passenger. (dogjaunt.com)
Your instruction permit allows you to drive during the behind - the wheel portion of your driver education class with an adult instructor occupying the seat next to you. (drive-safely.net)
His state of health as we all have seen is not good enough for him to still occupy that seat. (newsdiaryonline.com)