Based on studies a person is 11 times more likely to be in an automobile accident or collision when they have reached the Blood Alcohol Concentration (BAC) of .08. This is considered the "legal limit" in the United States. Mothers Against Drunk Driving (MADD) helped to pass the legal limit of .08.
The 17th amendment was ratified in 1913. So before the ratification, the senators were chosen by the states legislature, but after the ratification it was a popular vote that disided the senator.