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student traffic warning school bus crossing arm 

A school bus crossing arm is a safety device intended to protect children from being struck while crossing in front of a school bus. 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.