Which of these barrier devices does not exist?
Signage: Beacons and temporary signage
Explanation
In the context of barrier devices in traffic, it is important to understand which types exist and which do not.
- **Provisional directional panel**: This device is a beacon signal that **prohibits passage** and **indicates the direction** to follow on a road. It is used to manage traffic in temporary situations, such as roadworks.
- **Mobile barrier or semi-barrier**: Although not specifically mentioned in the provided excerpts, this type of barrier is common in traffic control situations, such as at level crossings or entrances to restricted areas, where temporary access control is needed.
- **Emergency barrier**: It is not mentioned in the excerpts or in the images provided. This suggests that it is not a recognized or used device in the context of traffic signals or safety devices in circulation.
Therefore, the **emergency barrier** does not exist as a barrier device in the context of the traffic signals and safety devices mentioned.
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