A two-inch line on the floor that all passengers must stay behind
Buses that allow passengers to stand must have some way to show passengers that they must stand behind the driver. This can be a two-inch-wide line (called the standee line) on the floor behind the driver's seat.
B A line at the back of the bus where passengers must stand before exiting
C A two-inch line down the aisle to keep passengers away from the driver
D A line around each seat to give each passenger a little personal space