</mapframe>William Kissam Vanderbilt II, the great-grandson of Cornelius Vanderbilt, was an auto-racing enthusiast and created the Vanderbilt Cup, the first major road racing competition, in 1904. He ran the races on local roads in Nassau County during the first decade of the 20th century, but the deaths of two spectators and injury to many others showed the need to eliminate racing on residential streets. Vanderbilt responded by establishing a company to build a graded, banked and grade-separated highway suitable for racing that was also free of the horse manure dust often churned up by motor cars. The resulting Long Island Motor Parkway, with its banked turns, guard rails, reinforced concrete roadbed, and controlled access, was the first limited-access roadway in the world.