Which of these is NOT a barrier device?
Signage: Beacons and temporary signage
Explanation
To understand why the **flashing red light** is not a barrier device, it is important to know what barrier devices are and how they work.
- **Barrier devices** are elements used to **prohibit passage** or **control access** in certain areas of the road. Examples of these devices include **flashing yellow lights** and **movable semi-barriers**. Flashing yellow lights prohibit passage through the space between them, while movable semi-barriers are physical barriers that are raised or lowered to allow or block passage.
- On the other hand, a **flashing red light** is not mentioned as a barrier device in the provided texts. Although fixed red lights indicate that a road is closed to traffic, flashing red lights are not used to block passage directly as physical barriers or flashing yellow lights do.
Therefore, the **flashing red light** is not classified as a barrier device, as it does not fulfill the function of directly prohibiting passage as the other mentioned options do.
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