Hi
there are no actual reverse fog lights. Sometimes someone puts an odd amber light in the backup socket and rewires it but that is foolishness. Real rear foglights have been required for years in Europe and you see them here sometimes (such as Olds Aurora). A standard tail light is low brightness with modest reflector so you will not be blinded by a super bright taillight. Now they will add a different tail light, typically a 21w bulb, with a reflector and red lens. When this is manually turned ON you will have a super bright taillight. When you are driving in fog, rain, or snow the extra brightness is dimmed by the mist / snow / etc.but hopefully the extra brightness will keep you from being part of a 300 car collision, as in England, Germany, and California. This is how Volvo works. The USDOT have always been reluctant to permit this, hoping for a radar control system. New stuff may make radar cheaper. You can get external rear fog lights on Euro E-bay. Small, non collectable ones were around $25 delivered a few years ago.
there are no actual reverse fog lights. Sometimes someone puts an odd amber light in the backup socket and rewires it but that is foolishness. Real rear foglights have been required for years in Europe and you see them here sometimes (such as Olds Aurora). A standard tail light is low brightness with modest reflector so you will not be blinded by a super bright taillight. Now they will add a different tail light, typically a 21w bulb, with a reflector and red lens. When this is manually turned ON you will have a super bright taillight. When you are driving in fog, rain, or snow the extra brightness is dimmed by the mist / snow / etc.but hopefully the extra brightness will keep you from being part of a 300 car collision, as in England, Germany, and California. This is how Volvo works. The USDOT have always been reluctant to permit this, hoping for a radar control system. New stuff may make radar cheaper. You can get external rear fog lights on Euro E-bay. Small, non collectable ones were around $25 delivered a few years ago.