Seriously don't take an ordinary passenger car up a dirt logging road in the Cascades, Oregon coast mountains, or Olympic peninsula mountains in mid Winter unless you are intimately familiar with the entire road, and have driven it many times before. There are huge dead areas of zero cellular coverage where your only option would be long range vehicle mounted vhf-uhf radio, or iridium satellite phone.

I have a high clearance 4x4 with 31x12.5" AT tires and still wouldn't try to take a shortcut like that.

Not so much because I'm terribly scared of getting stuck, in first gear, but putting on tire chains in a muddy slushy pacific NW winter is not really my idea of fun or a time saver.