UAV Enabled Vehicle Perimeters

The technical description relates to perimeters for vehicles. Specific examples relate to vehicle perimeters established by unmanned aerial vehicles (UAVs), such as autonomous drones, for a variety of vehicle types, including manually-driven, partially autonomous, and fully autonomous vehicles. Perimeter devices, vehicles, including autonomous vehicles and human-controlled vehicles, UAVs, and related systems and methods are described. Perimeter devices respond to triggering events, such as vehicle-immobilizing events, GPS-based events, and environment-based events, to establish a perimeter adjacent a vehicle such that observers can visually detect the presence of a signal member, such as a warning triangle having a reflective surface. An example vehicle includes a tractor unit, a trailer connected to the tractor unit, a storage enclosure associated with the tractor unit, and a plurality of perimeter devices disposed in the chamber. Each perimeter device of the plurality of perimeter devices includes a triangular signal member, a base member, and a UAV. Each perimeter device is adapted to deploy from the chamber and establish a perimeter by the vehicle in response to a triggering event, such as parking of the vehicle in a location for which a perimeter must be established, impact of the vehicle with another object, such as during a traffic accident, rollover of the vehicle, or mechanical and/or electrical failure of the vehicle.