What color is the central light of traffic signals that control intersections usually?
Signage: Traffic lights
Explanation
The **circular traffic lights for vehicles** are devices that regulate traffic at intersections. These traffic lights use different colors of lights to indicate to drivers when they must stop or proceed.
- The **steady yellow light** on a circular traffic light is one of the central lights and has a specific meaning. It indicates that drivers must stop, similar to the red light. However, it allows passage to those vehicles that cannot stop safely. This makes it a warning light that prepares drivers to stop.
- In contrast, the **steady red light** completely prohibits passage, and the **steady green light** allows passage and gives priority at the crossing. These lights are not central but are at the ends of the traffic light cycle.
Therefore, the central light of intersection-regulating traffic lights is usually **yellow**, as it is used to warn drivers about the need to stop soon.
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