Final answer:
The fluorescent orange triangle with retroreflective borders is a warning sign for construction zones. It alerts drivers to potential hazards and provides advance warning of roadway work zones.
Step-by-step explanation:
The fluorescent orange triangle with retroreflective borders is a warning sign for construction zones. It is designed to alert drivers to potential hazards and provide advance warning of roadway work zones. The bright orange color and retroreflective borders make it highly visible during the day and at night. This sign is used to ensure the safety of both drivers and construction workers.