Understanding the Sport

Flags

When the green flag drops the cars come to life. Engines roar and drivers try to make their moves to the front.

These 15-minute sessions can make or break a race.

When the green flag drops, the engine comes to life. Learn more about the start of the race.

It's where races can be won or lost. When do you come in? Do you change four tires? Do you change drivers? Do you need fuel? IMSA pit stops are organized chaos.

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