I know this is going to be a really stupid question to most of you (and yes I am blonde) but here goes. I drive quite a bit in the winter and in every car I've ever had I have always put my car in low gear when it is really icy. It kept the car slow and I didn't have to use my brake much. My Murano doesnt have a low gear. It only has "D" (drive) but over on the side it has these other types of gears with a + and - sign. Is that what I would use to gear down? How do you use that?