1. Era 1.0: The Shelter Function Period ("One Pole, One Sign") Characteristics: Initially just a simple bus stop sign, later adding a simple canopy and benches. Materials: Wood, brick, or simple angle iron. Pain Points: Barely provides rain protection, lacks aesthetic appeal, high maintenance costs, and is completely dark at night. 2. Era 2.0: The Standardized Industrial Period ("The Stainless Steel Era") Characteristics: With accelerated urbanization, standardized metal bus shelters appeared. Materials: Galvanized steel pipes or ordinary stainless steel. Progress: Static advertising light boxes were introduced, solving the nighttime lighting problem, and city streets began to appear more uniform. 3. Era 3.0: The Aesthetic and Weather-Resistant Period ("Modernist School") Characteristics: Emphasis began to be placed on design and integration with the environment. Materials: 304 stainless steel, PMMA polymer material, tempered glass. Progress: Features include waterproof profiles, rounded corner impact-resistant designs, and attention to ergonomics (such as seats that are warm in winter and cool in summer), capable of withstanding extreme snowstorms and typhoons. 4.4.0 Era: Smart City Terminal (“Internet+ Era”) Characteristics: Bus shelters have become “thinking” public furniture. Technologies: 5G micro base stations, LCD dynamic information screens, solar power supply, monitoring and alarm systems, and even unmanned unmanned vending functions.