When driving in very heavy rain, can the front and rear fog lights be used?

FRONT FOG LIGHT: - Its installation and use is NOT compulsory. - It will be white or selective yellow. - It will be used, voluntarily, in case of fog, heavy rain, snowfall, smoke or dust clouds, or in circumstances similar to the above. - It may also be used on narrow roads with many curves, that is, those with a carriageway 6.5 m wide or less, signposted with «dangerous curves» signs. REAR FOG LIGHT: - Its installation and use is compulsory. - It will be red. - It will be used, compulsorily, in case of THICK fog, VERY heavy rain, HEAVY snowfall or DENSE clouds of smoke or dust. Front fog lighting, during the day, may be on only with position lights, but may also be used together with low-beam or high-beam. At night, it will be used at least with low-beam. Rear fog lighting, during the day, will be used at least together with the front fog light or the low-beam. At night, at least with the low-beam.