A signal passed at danger (SPAD), in British railway terminology, occurs when a train passes a stop signal without authority to do so. It is a term primarily used within the British Railway Industry, although it can be applied worldwide.
Read more about Signal Passed At Danger: Categories of SPAD, Causes, Collision Avoidance, SPAD Indicators, Passing Signals At danger - with Authority, Accidents Involving SPADs, Accidents Involving Stop and Proceed
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