We weren't wise enough to let the snow forecasts cancel our trip to Knoxville.  The roads were pretty bad tonight, and someone rear-ended us on I-75 near Detroit.  Thankfully, we weren't going very fast (due to slippery conditions and heavy traffic), and no one was hurt.  We also weren't smart enough to keep the car running, so we drained the battery waiting for the police to arrive.  The vacation is now a stay-cation at Grandma's.