US startup hopes to bring driverless tractors into the mainstream

A farmer electronically summons an autonomous tractor pulling a cart for grain to be loaded. With a cart in tow, the tractor navigates on its own to a path beside the combine to allow for continuous loading. (Smart Ag)

Seven years ago, three of the largest farm-equipment companies in America said they were close to introducing technology that would allow farmers to use driverless tractors pulling grain carts during the harvest. 

Today, no such product is widely available, and no near-term promises are being made by John Deere, Case IH or Kinze Manufacturing.