What color must the indicator light showing that a taxi is free be?
Lighting
Explanation
The **free indicator light** must be **green**. This color is used to indicate that a vehicle is available or in a condition to be used, as in the case of taxis that are free to pick up passengers. Although the provided fragments do not directly mention the free indicator light, we can deduce that green is the appropriate color, as other colors like **white** and **yellow** have different specific functions in the vehicle lighting system.
- **White** is used for the front clearance lights, which help indicate the width of the vehicle.
- **Yellow** is the color of the direction indicator lights, which warn when a vehicle is going to turn or change lanes.
Therefore, green is the color associated with indicating that a vehicle is free or available.
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