Night Travel between SM and GTO

[jesm]

Two routes, one vía Santa Rosa/Dolores goes thru mountains, while other vía La Sauceda is newer and more gradual. Both routes are two lane, curvy, quite so in stretches, and not well lit or populated for most part.
We are highly experienced road travelers but avoid routes like these after sunset. Both go thru long stretches of farmlands so wandering livestock alone says no-go.
The Santa Rosa route is a lovely drive in daytime, the newer not as scenic.