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This article introduces a conceptual safety alert system using ultrasonic sensors. The safety alert system was designed to detect moving objects in the vicinity of agricultural machinery. This system uses two ultrasonic sensors to detect the distances between the sensors and the moving object and a position detection algorithm to determine the moving objects position relative to the machinery. A stationary test bench was built to prove the concept of the safety sensing system. Validation tests in an outdoor environment indicated that the conceptual safety alert system was capable of detecting the position of a moving object in the vicinity of agricultural machinery in real time, and generating a timely warning signal to raise the attention of the operator for ensuring safe operations. This result proved that the conceptual system has tremendous potential for agricultural machinery applications.