I feel the auto light system on the CX5 is actually a step back in efficiency compared to my previous Mazda, They added a sensitivity setting that is seemingly more placebo than actually changing anything, but now I get this delay before they turn on that my previous car did not, in the same situation (going in a tunnel).
It takes up to 25 seconds sometimes to turn on the lights (no matter the sensitivity setting) this means I'm almost halfway thou the tunnel... kind of useless in this situation.
I think modern cars should turn them on as soon as wipers are working for more than one minute or so (or at the very least.. turn on the tail lights and keep th RDL's on for better visibility.
In fact, ideally, all cars should have rear rdl's running at all time. They could be different than the "night tail lights" in the same way the headlights function with the rdls and headlights. This, to me should be the next "big" safety measure taken by all car manufacturers.