>> that was call autonomic arousal. how alert you are.driver is neither too into ited or too accustom. >> are we required to be plugged into the car so it knows what we are doing? >> definitely not. eventually cars will drive themselves. >> making them the designated driver promises to revolutionize how we get around. for steve brown who is completely blind, cars will completely transform their lives. >> auto-driving. >> google gave steve a glimpse of the future inviting him to take the driver's seat in their first autonomous vehicle. >> how did that feel? >> incredibly normal and abnormal at the same time. >> the car was doing its thing. did you have instinctive responses? >> all the things you normally do in driving just came back. we're at the stop sign. >> even if you can't see? >> even if i can't see. i would suggest going to get a taco because that's what i would normally do. >> do you think you'll be back this this ♪ yemen's exiled government declares the southern port city of adan has been liberated but the fighting goes on. ♪ >>