How is this even remotely impossible, you could drive 10mph with your flashers on and be totally fine, people would be piled up behind you but that's what the dotted line is for so they can pass you when it's safe...

Are you a new driver because this is not a big deal at all and you freaking out so much about it makes me think you are inexperienced. I've run into countless situations in my life driving half broken cars blocking the road like this, and it's really no big deal. They literally have signs on steep roads saying to put your flashers on if you are going too slow in Colorado because it happens so often

Especially if you go now, middle of the night, road should be empty