Rear fog lights are made so that other cars can see you from further away in the fog. They are red and function basically as brighter position lights. While they can be mounted in the bumper, it is not unusual for them to be in the same position as the position lights, as their purpose is the same (making you seen). Since they are made for making you visible in thick fog, they are very bright, and it is illegal in many places to use them without reason as it can blind the driver behind you in regular conditions.
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Rear fog lights are made so that other cars can see you from further away in the fog. They are red and function basically as brighter position lights. While they can be mounted in the bumper, it is not unusual for them to be in the same position as the position lights, as their purpose is the same (making you seen). Since they are made for making you visible in thick fog, they are very bright, and it is illegal in many places to use them without reason as it can blind the driver behind you in regular conditions.