Under the system of segregation used on Montgomery buses, white people who boarded the bus took seats in the front rows, filling the bus toward the back. Black people who boarded the bus took seats in the back rows, filling the bus toward the front. Eventually, the two sections would meet, and the bus would be full. If other black people boarded the bus, they were required to stand. If another white person boarded the bus, then everyone in the black row nearest the front had to get up and stand, so that a new row for white people could be created. Often when boarding the buses, black people were required to pay at the front, get off, and reenter the bus through a separate door at the back. On some occasions bus drivers would drive away before black passengers were able to re-board.