This document discusses portable non-intrusive traffic sensors used by Kentucky Transportation Cabinet. It summarizes several sensor types: dual sensor and single sensor NILAD devices that detect axles without needing to enter the roadway; TIRTL infrared sensors that also detect axles but need software improvements; using existing ITS loops by tapping into loop racks; microloops under bridges; and radar sensors with a motorized angle adjustment or mounted on a telescopic flag pole or solar-powered cabinet. The sensors allow collecting traffic data without the safety risks of working in the roadway.