Why is there only one rear fog light?
2 Answers
The reason there is only one rear fog light is to distinguish it from the brake lights, preventing confusion between the two. Introduction to fog lights: When driving in adverse weather conditions such as fog, snow, heavy rain, or in smoke-filled environments, front fog lights are essential for illuminating the road ahead and ensuring driving safety. In recent years, fog lights have often been integrated into the design of the front bumper. Principle of fog lights: The filament of the light source is positioned at the focal point of the reflector's parabolic surface. After reflection, it forms a beam parallel to the optical axis. The diffuser lens then spreads and refracts the beam to create a wider horizontal light pattern, ensuring the light distribution and intensity comply with regulatory requirements.
This is quite interesting. I've looked it up and asked my mechanic friends. Mainly, safety regulations stipulate that only one can be installed, and most countries require it to be on the left side of the rear. Think about it—two red bulbs lighting up together in foggy weather can easily be confused with brake lights, making it more likely for the driver behind to get confused and rear-end you. A single one actually stands out more, like a little arrow pointing the way. The empty spot on the right is actually reserved for the reverse light, so the white light can illuminate the ground clearly when reversing at night. In terms of power, a single 25-watt bulb is strong enough to penetrate thick fog, so there's really no need to install two and waste electricity.
