Fog lamps must be positioned on a vehicle at which specific height range?

Fog lamps are designed to help improve visibility in low-light conditions, particularly in weather situations such as fog, rain, or snow. The correct positioning of fog lamps is crucial for their effectiveness and safety. They should be installed in a height range of 12 to 30 inches above the ground.

This specific height range allows the light from the fog lamps to get under the fog, rain, or snow, reducing the amount of light that is reflected back into the driver's eyes. By being low to the ground, fog lamps provide a wider and more focused beam of light that enhances visibility for the driver without causing glare for oncoming traffic. Positioning the fog lamps too high could result in scattering the light, making visibility worse rather than better.

The other options provided fall outside of this effective height range, compromising the functionality of the fog lamps and potentially creating safety hazards on the road.