How do you get the lower fog lights to turn off on a F150?
If this is a newer vehicle, this is a safety feature and there is no way to turn them off while the vehicle is in motion besides disconnecting the wires.
fog lights are not always yellow.... i have no answer to your ? but i can tell you as a mechanic that all fog lights are not yellow and do not need to be.... all a fog light is, is a light placed lower on your vehicle so the light is not reflected into your face when it is foggy.... look in your local laws but in California if it is foggy and your vehicle…
There isn't really a distance when you should use your fog lights, Switch on headlights, dip them if necessary and turn on fog lights if visibility is reduced. Fog lamps are very bright, however, so if you can see the vehicles behind you then it's likely they can also see you. In this case your fog lights will dazzle other drivers so turn them off