A video analytics algorithm, system, and method for use in real time allowing accurate, reliable, and timely warnings that facilitate traffic safety and efficiency. The system and method are readily implemented with minimal computational resources, providing broad applicability. In an embodiment, a video analytics method may include (a) obtaining a sequence of real-time images as input from a traffic monitoring system; (b) identifying a plurality of vehicles within a pre-defined region of interest; (c) tracking vehicles within the predefined region of interest; and (d) detecting a conflict event when the vehicles are located within a pre-determined maximum separation threshold based on each vehicles coordinates in a spatial-temporal domain.