In which situation will road works vehicles use the warning light?
Special vehicles
Explanation
**Work vehicles** must use a **yellow warning light** when performing roadwork. This light is essential to warn other drivers of their presence and the potential hazards their location may pose on the road.
- The yellow light must be on the entire time the vehicle is performing improvement or maintenance work on the road. This is especially important on highways or expressways, where the light must be on from the moment the vehicle enters until it reaches its destination.
- The main function of this light is to **alert other drivers** to the presence of the work vehicle, as its position on the road may pose a danger. It is not a signal to indicate stops or parking, nor is it limited to specific tasks like moving rocks.
Therefore, the warning light is used to ensure safety in situations where the presence of the work vehicle may pose a risk to traffic.
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