I know I should be RTFM, but since I'm a bit under the weather from a stomach flu, I know you guys will be kind enough to help me out..

When I bought my car, the dealership made me sign a document stating that I will not use chains on the tire.

I have a stock '05 5AT w/ Navi, which means I have the Michelin OEMs

Since I am planning a trip to Lake Tahoe, what kind of snow traction device can I use instead?