This is in South Florida.
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The race schedule usually includes a 5 lap scratch race, then a 3 lap sprint (just like a scratch race but just 3 laps) , then a 20-30 or 40 lap scratch race depending on how many riders.
They also break it up into A's and B's for each race.
There is a reason that officials stand on the lane looking up it. That is the only place to see a winner.