Methods and apparatuses for vehicles, including unmanned aerial vehicles (UAV). A method for traffic control can include detecting a traffic condition; determining whether to adjust a virtual traffic sign responsive to detecting the traffic condition; and adjusting the virtual traffic sign based on the traffic condition. Adjusting the virtual traffic sign can include encoding a message for transmission to a base station within a range of the virtual traffic sign, the message including at least one of a virtual traffic sign type and a virtual traffic sign value. Other methods, systems, and apparatuses are described.