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All racers are required to wear a rescue whistle. Here, Mike Sheldrake prepares for his race. 2017 Three Peaks Cyclocross. © D. Monaghan / Cyclocross Magazine

All racers are required to wear a rescue whistle. Here, Mike Sheldrake prepares for his race. 2017 Three Peaks Cyclocross. © D. Monaghan / Cyclocross Magazine