School bus crossing arm

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The crossing arm can be seen in use. Note the presence of the rotated yellow bar on the front bumper.

A school bus crossing arm is a safety device intended to protect children from being struck while crossing in front of a school bus. A major hazard to children riding school buses is being struck by their own bus. In the United States, approximately two out of three students killed outside a school bus are not struck by other vehicles, but by their own bus, and the front of the bus is considered one of the most hazardous areas.

Typically, school bus crossing arms are wire or plastic devices which extend from the front bumper on the right side of the bus while it is stopped for loading/unloading and form a barrier. The purpose of the device is that children who need to cross the road will be forced to walk several feet forward of the front of the bus itself before they can begin to cross the road, thus ensuring that the bus driver can see them as they cross in front of the bus, avoiding a common blind spot immediately in front of the bus. The crossing arm retracts flush against the bumper while not activated, such as when the bus is in motion.

Unlike traffic warning lights and many other safety-related features typically found on school buses in the United States, crossing arms are not required by the Federal Motor Vehicle Safety Standards (FMVSS) for School Buses. Regulations for equipment and use vary widely on a state-by-state basis. in some places, they are optional at the discretion of a local school district or school bus contractor.