Which of the following guidance devices does NOT exist?
Signage: Beacons and temporary signage
Explanation
In the context of road guidance devices, it is important to know the different types of **milestones** that exist to help drivers navigate safely.
- **Edge milestone**: This type of milestone is used to mark the edges of the road, helping drivers identify the boundaries of the roadway and keep their vehicle within the appropriate lanes. It is a commonly used device on roads.
- **Vertex milestone**: Although not specifically mentioned in the provided fragments, this type of milestone could refer to a point of intersection or change of direction on the road, similar to how direction is described on roads, which can be a straight or curved line connecting two places.
- **Curve milestone**: There is no specific guidance device called a "curve milestone." Curves on roads are usually signaled with other types of signs or devices, such as permanent direction panels, which indicate the degree of danger in a curve by the number of panels present.
Therefore, the **curve milestone** is not a recognized guidance device, making it the correct answer to the question about which of these devices does not exist.
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