An apparatus for traffic control is disclosed. A method and a system also perform the functions of the apparatus. The apparatus includes an alert module that broadcasts an alert signal to a vehicle on a roadway. The alert indicates a presence of an alert zone along the roadway. The apparatus includes an alert zone module that broadcasts a location of the alert zone, where the alert signal has a signal strength sufficient for an autonomous vehicle control system of the vehicle to receive the alert signal a predefined distance before entering the alert zone as the vehicle approaches the alert zone. The apparatus includes an instruction module that broadcasts one or more instructions regarding driving within the alert zone.