Smith left the racing business in the early 1960s to pursue other business ventures .
Bruton Smith began building SMI in the 1950s when he worked as a race promoter and eventually built Charlotte Motor Speedway in 1959 .
Bruton Smith left the racing business in the early 1960s to pursue other business ventures .
Bruton Smith began building SMI in the 1950s when he worked as a race promoter and eventually built Charlotte Motor Speedway in 1959 .