. . . . "Emergency vehicle warning systems"@en . "Emergency vehicle warning systems" . . . . . . . . . . "The subject of visual and auditory warning devices (lights and sirens) for emergency and service vehicles is surveyed from a broad perspective. The report should provide directly useful information at all levels from the selection of hardware to a general understanding of the psychophysical factors determining the effectiveness of these devices. Topics covered include: an analysis of warning signals; the present situation and the need for uniform national standards; suggested performance standards for warning light systems and for sirens, including the reasons for the principal requirements; recommendations for actions that can be taken to improve the signal effectiveness of emergency vehicles; and brief summaries of some of the physical measurements that are made on a selection of lights and sirens."@en . . . . . . "Law enforcement equipment technology"@en . . "User guide to warning lights and sirens for emergency vehicle warning systems"@en . . . . . . . . . . . . . . . . . . "Color/ Chromaticity." . . "Sirens." . . "Véhicules prioritaires Avertisseurs sonores." . . "Sound." . . "Warning systems." . . "Optical Contrast/ Conspicuity." . . "Emergency Vehicles." . . "Emergency vehicles." . "Attention." . . . . "Emergency Vehicle Flashers." . . "Véhicules prioritaires Éclairage." . .