Travelogs provided guides for travelers driving the Old Spanish Trail (OST) auto highway, which connected St. Augustine to San Diego. Broussard was listed on the map, and the March 1929 travelog gives the following description:
The three largest sugar mills in Louisiana are on the Old Spanish Trail: Raceland, Franklin and Broussard. The bagasse, the stalk after the cane juice has been pressed out, was formerly used as fuel, now is made into Celotex for insulating material. Visitors are welcomed.
Read more here: The Old Spanish Trail Auto Highway in 1929