On a section or stretch of a motorway or an expressway, what does the sign in the image indicate?
Signage: Vertical signs
Explanation
Speed control on motorways or dual carriageways
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Sign **S-991b** indicates that at that **point or stretch** of a **motorway or dual carriageway** there is a **speed control device** (for example, a fixed speed camera or average-speed camera).
- It may be accompanied by sign **R-301**, which indicates the **maximum speed** being controlled.
- It may also have **additional panels** above or below with **additional information** (for example, type of control, length of the section, etc.).
Its function is to warn the driver that **speed will be monitored** and that the **indicated maximum speed** must be observed or, if none is indicated, the **general speed limit** for the road.
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