Question: What regulations have Hudson as the winning constructor?
SQL: SELECT "Regulations" FROM "2-15470199-1" WHERE "Winning constructor" = 'Hudson';

Question: What regulations have Carlos Arzani as the winning driver?
SQL: SELECT "Regulations" FROM "2-15470199-1" WHERE "Winning drivers" = 'Carlos Arzani';

Question: What is the latest year that has Ferrari 166 FL as the winning constructor?
SQL: SELECT MAX("Year") FROM "2-15470199-1" WHERE "Winning constructor" = 'Ferrari 166 FL';