A data integration apparatus for use in a sensor network system is provided. A test circuit can include a plurality of semiconductor devices connected in parallel, a first contact pad coupled to a first terminal of the semiconductor devices, and at least a second contact pad coupled to a substrate terminal associated with the semiconductor devices. It is determined from one or more conditions whether the operator of the vehicle is attempting to drive the vehicle straight on approximately level ground. The optimization of the corrected wavefront can involve representing the measured wavefront and the lens wavefront on a grid. The resilient-but-flexible shaft easily bends around trees and similar obstructions but returns to an original, linear configuration when a stressing force is removed to prevent entangling.