SINGAPORE – High-tech Singapore is planning to roll out a swarm of drones for tasks that include delivering parcels, inspecting buildings and providing security, but safety and privacy concerns mean the initiative may hit turbulence. Companies have already started testing the devices for commercial use, mainly in an area of over 200 hectares (500 acres) dotted with high-rise buildings and shopping malls, specially designated by the government for the trials. It is part of the affluent city's drive to embrace technological innovation, as well as an effort to tackle a manpower shortage in a country of just 5.6 million, which relies on foreign migrant workers in many low-paying sectors. Commercial use of unmanned aerial vehicles is already taking off around the world, in areas as diverse as crop-spraying and surveying for insurance claims, but Singapore's push represents a particularly ambitious bet on the technology. Singapore's Civil Aviation Authority has got behind the project, saying it recognizes the potential for drones "to transform mobility and logistics," and is working with industry players as it seeks to shape regulations for the sector.