I saw this story on the local news.
At one point in the coverage, they showed where the car had gone over the embankment from the vantage point of someone driving down the road. There's no way that a passersby could have seen the car, coming from either direction. Worse still, there were absolutely no skid marks, the grass wasn't torn up, and no trees in the area were broken in a way that would be easily noticed.
As was mentioned in the Washington Post article, he was less than a mile from home.
It's another illustration that no matter how short the trip, even if in the most well-traveled areas, you should always carry your gear with you.
As Doug mentioned, at least he had his pocket knife.
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"Learn survival skills when your life doesn't depend on it."