An emergency vehicle control system includes, among other things, one or more functional warning units positioned in various positions in an emergency vehicle. In the other surface of the semiconductor substrate, an n+ buffer layer, a p+ collector layer, and a collector electrode are formed. The housing of the actuator unit is provided with at least one enlargement in each inner surface facing an actuator pin. A determination is made whether the detected vehicle is violating a parking regulation based on a position and size of the vehicle within the boundary. The isolation between ports provided by the balanced 90 hybrid coupler is approximately 35-40 db which is sufficient to allow the independent operation of transceivers connected to the input ports. A third lens is positioned proximal to one end of the barrel, which has a fastening member and an engaging member, wherein the engaging member is accommodated with the fastening member to compactly couple the third lens with the end of the barrel.