Barrier **devices** are a type of **channeling signal**. These signals include lights, cones, flags, and panels used to highlight roadworks and obstacles on the roads. Their main function is to indicate the direction to follow and warn about possible dangers.

- **Channeling signals**: These signals can be red or yellow lights, directional panels, cones, and flags. For example, a **fixed red light** indicates that the road is closed to traffic, while **yellow lights** prohibit passage through the space between them.


- **Provisional** and **permanent directional panels** are also part of the channeling signals. These panels inform about the direction to follow and the level of danger in the area.

Therefore, barrier devices are classified as **channeling signals** because they fulfill the function of guiding and warning drivers about obstacles and directions on the road.