Ключевые слова: 20, alertness, authority, billboard, british, camden, city, concept, conceptual, control, design, district, drive, england, english, europe, great britain, hampstead, inculcate, instill, london, mph, no people, outdoor, pavement, pillar, politics, propaganda, restriction, road, road safety, safer streets, safety, sidewalk, sign, slower speeds, speed, speed limit, street, symbol, traffic, transport, transportation, travel, twenty, twenty miles, twenty zone, uk, united kingdom, urban,