Traffic cones, also known as conical traffic road signs, road markers, ice cream cones (commonly known in Hong Kong), commonly known as road cones, triangular cones, are generally conical or cylindrical temporary road signs, generally used for engineering and reminders in the event of an accident Passers-by are used to ensure the personal safety of engineering personnel and road users, or to be used for traffic diversion, separation of people and vehicle groups, or merging. But in other cases, everyday traffic separation/merging uses less portable "permanent" road signs/signs.

The earliest traffic cones can be traced back to the concrete traffic cones manufactured by Charles P. Rudebaker in 1914. Since modern times, the traffic cones have been made of thermoplastic or rubber with bright warning colors for road users to observe at a distance. Recycled PVC can also be used to make traffic cones. In addition to traffic cones, island lights can also provide a similar function.