Toyota believes that it can make human inputs largely unnecessary from highway drives in vehicles by 2020. To prove what the company can do, the Lexus GS Highway Teammate concept shows the tech in action right now.The race is on to get increasingly sophisticated forms of autonomous driving technology on the road, and brands like Tesla are bringing these solutions to some drivers now. But as one of the world's largest automakers, it's no surprise to see Toyota competing in the field, as well. By 2020, the company thinks a person could be largely unnecessary for freeway trips. With a suite of tech called the Highway Teammate, a modified Lexus GS is already showing what's possible.