In the summer I only carry a metal folding shovel in my vehicles. In the winter, I add a collapsible snow shovel. Kind of like this (if the picture works right):



There have been a few times in winter where I was glad I had both. The plastic shovel is good at moving snow or road debris quickly and I don't worry when it comes to taking snow off the windshield with it. Whereas, the metal shovel has the capability to deal with stuff that's a bit harder like light ice and dirt.