Ключевые слова: 30, 30 kph, asphalt, asphalt road, asphalt street, black and white, black white, blackandwhite, blackwhite, carriageway, color, grade, gray, icon, information, labeling, marked, marking, monochrome, number, numbers, outside, printing, road, road marking, road rules, road traffic, roadway, sign, speed, speed limit, speed limit of 30, speed restriction, street, street traffic, thirty, traffic regulations, traffic rules, traffic signs, transit, transport, urban transport, urbane, velocity, writing,