BIR meaning in Sports ?

Answer:

What is Brainerd International Raceway mean?

Brainerd International Raceway is a road course, and dragstrip racing complex northwest of the city of Brainerd, Minnesota. The complex has a 0.25-mile (0.402 km) dragstrip, and overlapping 2.5-mile (4.023 km) and 3.1-mile (4.989 km) road courses. The complex also includes a kart track. The raceway hosts the National Hot Rod Association's Lucas Oil Nationals. It is a popular racetrack for the Trans Am Series. The spectator seating capacity of the circuit is 20,000.

reference

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Brainerd International Raceway	Sports