1. A method of automated determination of retroreflectivity values for reflective surfaces comprising: strobing a light source to illuminate an area that includes at least one reflective surface without targeting the light source on a particular reflective surface; collecting a plurality of light intensity measurements with at least one intensity sensor directed to cover a field of view which includes at least a portion of the area illuminated by the light source; and using a computer processing system to: identify a portion of at least one light intensity measurement associated with one of the at least one reflective surfaces; and analyze the portion of the at least one light intensity measurement to determine at least one retroreflectivity value for that reflective surface.