My wife asked a simple question today - with light switch in auto, on a murky misty morning but not dark enough to see the headlamp beam, how do you know you are not just on DRLs? She did the sensible thing and put the light switch to manual headlamps but I couldn't give a satisfactory answer - ours is a shuttle with factory auto lights - do some models have a lights on indicator or can something be retro fitted?