School Bus Stop arms are one of the most important part of School bus safety. Here is the history of stop arms.

Manual Operated (1922-1945)[edit | edit source]

Manual stop arm.jpg

School Bus stop arms were first introduced in 1922 and were originally Manual Operated. And the Blades from Manual operated stop arms were also reused on some air operated stop arms.

Air Operated (1945-1992)[edit | edit source]

1945-1965[edit | edit source]

Air operated stop arm with lights (High Quality).png

1965-1992 (still exists on some school buses with air brakes although most new modern school buses use electric stop arms)[edit | edit source]

Air operated stop arm with stop sign.jpg

Air operated Stop arms were the first automatic stop arms and in 1965 the blades have changed from an actual blade to a stop sign. But air operated stop arms are still used on some school buses with air brakes.

Electric Operated (1992-present)[edit | edit source]

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