1. A system for alerting motorists travelling on a roadway in a vicinity of a school bus, the school bus comprising a deployable stop arm, the system comprising one or more projector units, and a respective attachment structure for each of the one or more projector units for attaching the projector units to a portion of the school bus such that the one or more projector units are configured and arranged to project a light signal on to at least a portion of the roadway adjacent the school bus and in a travel path of the motorists, the one or more projector units including at least one signage projector unit configured to project a STOP sign on to the roadway in the travel path of the motorists when the deployable stop arm is deployed.
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