The "Internet of Things" surpasses traditional network limits and extends the virtual world by linking to real-world objects. Sensors and tags can identify a specific object and gather real-time information about its surrounding environment, such as temperature, location, pressure, noise, light, or humidity. This new technological scenario, fueled by great leaps in wireless and satellite technology, fosters the development of innovative context-dependent applications, which have already begun to pervade our society. Especially relevant are applications in the fields of safety and accident prevention.