I don't know if I would call this a hidden feature but I've noticed that when at a traffic light and I turn on my blinker, that sometimes the reflection in the bumper in front of me showed a glowing light that dimmed. Finally, I decided to have a look for myself.
When you engage a turn signal, the high beam light on the side that the blinker is flashing will also light up with a yellowish amber glow. Then that headlight will fade to black away after about 5-7 seconds. Cool feature that I never noticed until recently.
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