Good advice for blizzard

One day in the downtown, it was snowing heavily and blowing to the point that visibility was almost zero when Lena got off work. She made her way to her car and wondered how she was going to make it home.
She sat in her car while it warmed up and thought about her situation. She remembered a friend's advice that if she got caught in a blizzard, she should wait for a snow plow to come by and follow it. That way she would not get stuck in a snow drift. This made Lena feel much better and sure enough in a little while, a snow plow went by, and she started to follow it. As she followed the snow plow, she was feeling very smug as they continued, and she was not having any problem with the blizzard conditions.
After quite sometime had passed, she was somewhat surprised when the snow plow stopped and the driver got out and came back to her car and signaled her to roll down her window. The snow plow driver wanted to know if she was all right, as she had been following him for a long time.
She said that she was fine and told him of the advice she'd received to follow a snow plow when caught in a blizzard.
The driver replied that it was OK with him, and she could continue if she wanted...but he was done with the Wal-Mart parking lot and was going over to Zellers next.