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Many cities now operate bicycle-sharing schemes, allowing residents to rent a bike from one docking station and return it at another. Early systems required riders to return bicycles to fixed docks, but newer 'dockless' models use GPS tracking so bikes can be left almost anywhere within a service zone. Proponents argue these schemes reduce short car journeys and ease congestion, though studies show usage drops sharply in poor weather and hilly terrain. Critics point out that dockless bikes are sometimes abandoned haphazardly, blocking pavements and drawing complaints from pedestrians and disability advocates. To address this, several municipalities now cap the number of bikes an operator may deploy and require companies to rebalance bicycles across neighborhoods, ensuring availability does not concentrate only in wealthier, flatter districts.