A similar problem happens during unusual big snowfalls in the country or in the mountains. The primary roads turn red because the cars are going really slow cz there is 50cm of snow. So maps redirects you to secondary roads, where there is nobody and even more snow.
I was trying to navigate to a hotel because I knew we couldn't make it back in this weather, but all the closest hotels weren't on main roads. I was desperately trying to figure out a way to tell Google "prefer main roads" so we could find a hotel that was several miles further away if that meant sticking to safer roads.
I thought a lot about how a feature like that could save lives in an emergency. Does this already exist anywhere?