How do you stop people driving modern cars in daylight, in fog, without the lights on?

Modern cars increasingly have automatic lights.

So users assume that the car is going to turn the lights on for them.

However in daylight in fog the automatic system doesn't work (as its not dark enough).

How do you stop people driving along in fog thinking that their lights are on ?

(This is an example of the Paradox of Automation BTW )