For those on the DRL kick, the DRL Dropout does indeed toggle the DRL when the turn signal is active. In my case, I have my high beams set as DRL, and I can confirm that the setting does work. I would also imagine it will work with low beams as DRL. However, with turn signal set to DRL... well it stands to reason that the turn signal will still be a turn signal, and flash. As far as fog lights as DRL, I will try to find time later this afternoon to mess with it and see how those react, but my gut tells me that the dropout will only be effective with either high or low beams set as DRL.