A partially transparent dome mirror is used to display messages generated from within the dome by a light generating system. The mirror is incorporated in an apparatus for seeing and warning traffic crossing at an intersection in a commercial, industrial or other space to improve worker safety and to avoid costly damage due to collisions at the intersection. The unitary apparatus does not require sensors or other wiring external to the mirror and its supporting frame. The mirror system can also be used in commercial and retail applications for surveillance and advertising.