Mystery

So I live near this long stretch of fairly narrow highway, and I just can't seem to figure this out! Every morning when I am driving to work there are like 50 joggers running off the "side" of this highway. We have had a TON of snow and the roads have been really, really bad. I just can't figure how this is enjoyable to the people running, when the cars are blazing by 50 mph spraying them with dirty slush and at any moment could hit an icy patch and that would be the end of their days. Period. No more running, jogging, hiking, zilch. Mystery.