Ключевые слова: alert, camera, car, caution, city, clouds, device, driving, electronic, forewarning, guidance, highway, indicator, info, information, instruct, led, light, limit, limitation, luminous, message, navigation, panel, placard, post, radar, regulate, restriction, road, roadside, roadsign, roadworks, round, rule, safety, showing, sign, signal, signpost, sky, speed, street, traffic, transportation, travel, urban, vehicle, warning, way,