A traffic control system includes a vertically and horizontally disposed pole. The invention further relates to a system comprising a first device and a second device adapted for wirelessly communicating with each other. A control system connected to the crane includes a user interface electronically coupled to a command potentiometer and a programmable controller responsive to the command potentiometer for controlling the angular position of each of the first front wheel, the second front wheel, the first rear wheel and the second rear wheel to effect a steering mode selected through the user interface. When the optical filters having such a cutoff characteristic are provided, each of the optical fiber lines is monitored by use of a plurality of channels of monitor light other than the one cut off by the optical filter provided so as to correspond thereto. A method of size reduction is disclosed for universal application of a reduction burr to precisely reduce enamel or ossiferous surfaces in both lateral and longitudinal directions.