Since 2004, Cincinnati-based ALERT Safety Products has designed and manufactured custom forklift and pedestrian warning systems for plants and warehouses. Its microwave-sensor technology detects approaching vehicles at blind corners, intersections and doors, activating devices such as the Mirror ALERT or Project ALERT while ignoring traffic moving away. The company grew from a request to warn high-mast forklift operators about low-bay doors and continues to shape systems around customer layouts and traffic patterns.