Self-driving 18-wheeler being tested in San Antonio

SAN ANTONIO, Texas (NBC News) – The technology in cars seems to continue to grow, but what about a self-driving semi-truck? Self-driving vehicles are being tested at various locations across the country including at the Southwest Research Institute in San Antonio.
On the outside, the truck looks like the typical big rig, but with the simple push of a button, it turns into something that most might compare to a Transformer movie.
The institute tested a real life self-driving semi-truck on t