Final answer:
Clearance lamps mounted near the rear of a vehicle must be red to signal its presence to other drivers. They're crucial for safety and their specifics can vary by local regulations. Theoretically, if a blue object is illuminated by red and green light, it will appear yellow due to the absorption and reflection of light.
Step-by-step explanation:
The question you're asking pertains to vehicle lighting regulations, which varies by country and state. However, generally speaking, clearance lamps mounted on or near the rear of a vehicle are required to be red. These lamps, also known as tail lights, are essential for the safety of the vehicle as they signal its presence to other drivers, especially in dark or low-visibility conditions.
The purpose of these lamps is to ensure that the dimensions of the vehicle are clearly visible to other road users, which helps prevent collisions. Different countries and regions may have specific requirements for the brightness, number, and positioning of these lamps, so it is important to check the local laws and regulations to ensure compliance.
If we consider a theoretical scenario where a blue section of a wheel is being illuminated with both red and green light, it would appear yellow. This is because the blue pigment absorbs the blue light and reflects the red and green light, which when mixed together appear as yellow to the human eye.