I helped a colleague in defining a concept he was working on for new functionality in the Skånetrafiken (local public transportation in the south of Sweden) application/website that also involves bus drivers. Bus stops on the country side often suffer from poor visibility and drivers often miss travelers waiting for the bus. The idea is to provide bus drivers on countryside routes with more information about whether or not there are travelers waiting at bus stops on his route. The traveler would have to take an active role in providing the information by expressing an intention to travel that becomes an indication of presence once the traveler is at the bus stop.
To make it easier to explain the concept I quickly drew up this storyboard that illustrates it: