The present invention relates to an emergency assistance beacon signal methodology for law enforcement, emergency and military personnel by which such personnel who encounter an imminent need for assistance or rescue while on duty in a vehicle, may utilize such methodology to invite the assistance or rescue of other such personnel. Upon a first personnel determining that assistance or rescue is needed, the first personnel activate a powerful light element attached to a such that the powerful light directs a beam of light upwardly and non-horizontally from the vehicle. Upon a second personnel recognizing the beam of light, travels to a general area of the beam of light to locate the first and provides first personnel assistance or rescue. In another embodiment of the present invention, an emergency assistance beacon signal system includes a) a roof-mountable emergency signal device for mounting on the roof of a law enforcement, emergency or military vehicle, the device including an upwardly, non-horizontally directed powerful light source having at least one upwardly, non-horizontally directed beam of light adapted to be energized by an activation mechanism operable by a personnel who is using the vehicle; and, b) the activation mechanism in proximity to and operable by the officer who is using the vehicle.