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In developing countries, the collection and transportation of solid wastes remain a challenging task due to rapid urbanization, population growth, unplanned settlements, narrow streets, and lack of financial resources. Unlike developed nations where highly mechanized systems dominate, developing countries often rely on small-scale, flexible, and low-cost collection vehicles suitable for diverse urban environments. Small waste collection vehicles play a significant role in primary collection, door-to-door services, and transporting waste from narrow or congested areas to community bins or transfer stations. Their adaptability, affordability, and ease of operation make them essential in improving sanitation and efficiency in solid waste management systems. One of the most common vehicles used is the handcart or pushcart. Handcarts are low-cost, non-motorized, and manually operated by waste workers. They are widely used in narrow streets and congested urban areas where larger vehicles cannot enter. Typically, handcarts are fitted with two or four wheels and a container or box for carrying waste. Some designs have partitions to separate biodegradable and non-biodegradable waste. They are effective for door-to-door collection within small distances, after which the waste is transferred to larger community bins or secondary collection vehicles. Although limited in capacity, handcarts are extremely useful in slums and densely populated neighborhoods. Their low maintenance cost and simple design make them sustainable, but they require significant human effort and can expose workers to health risks if not designed ergonomically. Another small-scale option commonly employed is the cycle rickshaw or tricycle cart. These are pedal-operated vehicles with a waste container fitted at the back or front. Tricycles provide a slightly larger carrying capacity than handcarts and can cover longer distances. In many cities across South Asia, such as Delhi, Dhaka, and Kathmandu, tricycle carts are used for door-to-door waste collection in residential colonies. They can carry 200–400 kg of waste, depending on design. Since they are non-motorized, they __________ ______ ___ ___ ____ ______ _________ __________ ____ _____.
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