Native Americans living near the Magnolia Bridge were hunters and gatherers who relied on the Santa Ana River for water, bathed in local hot springs, and made baskets and hats from local sumac; the decorative discs on the bridge lights are based on their tray basket designs used for offerings during religious ceremonies, and the diamond-shaped patterns signify fertility. Corona's early industry included the Temescal Tin Mine, which produced tin until 1893, and Pacific Clay Company, which began mining clay in 1886 for roof tiles that are still made there today. Early land speculators developed citrus groves and found lemons better suited to the area than oranges, and by 1912 Corona was known as "The Lemon Capitol of the World"; later, the nation's first lemon processing plant was built there. From 1915 to 1931, Riverside and Corona were connected by the Pacific Electric Red Car Line along Magnolia Avenue, a 6.6 mile trip that took 22 minutes. Originally called South Riverside, the community voted in 1886 to become a city and take the name Corona, meaning "crown," after Grand Avenue, a circular street 3 miles in diameter built by R.B. Taylor for carriage parades. Grand Avenue also hosted auto races in 1913, 1914, and 1916 that each drew more than 100,000 people, and Earl Cooper set a world speed record in 1913 before the races ended after 1916 because promotion costs were too high.