For John, BLUF: You do this already, no? Nothing to see here; just move along.
It appears that, effective 7 April, it will now be Massachusetts law that you must have headlights on when running windshield wipers. I guess I was a little surprised when I read this. Decades ago I lived in a state where this was already the law. While it may seem a bit of over-legislating, legislation is a way of convening common sense.
Regards — Cliff