Self-driving truck delivered butter across America

SAN FRANCISCO -- A Silicon Valley company used an autonomous truck to transport 40,000 pounds of butter from California to Pennsylvania.

The company announced the 2,800 mile trek Tuesday. There was a safety driver on board the self driving truck to take the wheel in case something went wrong. A safety engineer observes how things were going.

The truck traveled on two interstates, I-15 and 70 just before the Thanksgiving, taking several scheduled breaks. The company says there were zero "disengagements" or times the self-driving system had to be suspended because of any problems.

There are approximately 10-15 companies throughout the country currently working on autonomous freight delivery