Chicagoans have a choice Sunday: either join the 1.5 million people expected to watch the Chicago Marathon -- or try to avoid it altogether. But it won't be easy, as 45,000 runners will clog up the 26.2 mile race course and more streets for a good part of the day. Meanwhile, those running in the race should take precautions, experts said, especially with forecast temperatures in the high 70s.
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