Piston Slap: The Underutilized Headlight Phenomenon

TTAC commentator idesigner writes:

Sajeev,

Last night during my drive home I saw something I see all too often: In the year is 2017, there are still cars and trucks that don’t have all their driving light on! Instead, they’ll only illuminate their front lights (and I can imagine dash light as well) but not tail or side lights.

What’s up with this? Aren’t auto manufacturers smart enough to fix this phenomenon? Why isn’t there a sound like the seat belt chime that tells you your lights are not on?

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