If you are driving with your low-beam lights turned on in heavy rain limiting visibility, can you also use the front anti-fog lights?

Yes, in this situation you are entitled to use the front fog lights. The green indicator light shown in the illustration signals that they are switched on. According to Art. 30 para. 1 of the Road Traffic Act, in conditions of reduced air transparency, for example caused by heavy rain, the driver may switch on the front fog lights together with the dipped headlights.