Not long ago, Car and Driver tested a Model S on Autopilot over a 50-mile course complete with rural, city, and freeway driving. It called the car the world's best semi-autonomous vehicle.

Sparks focused his drive on the highway, since he believes that this is the intention of Autopilot mode and also how most people will choose to engage it. He made it 61 miles without intervening at all! All he did was adjust the cruise control and occasionally tap the steering wheel.

Sparks explains:

"In a 61-mile drive, which passed through several cities, including the 27-mile-long stretch of Colorado Springs, I didn't have to steer or use the pedals a single time. I even changed lanes when I normally would have — though by a tap of the blinker each time instead of by turning the wheel. Other cars on the road would have never guessed it wasn't a human driving. Model S slowed when slower vehicles cut in front of me, sped up when they moved, and accelerated with eerily human-like driving skills amid lane changes when passing vehicles. And it avoided off-ramps when I was in the right lane — even when there were no markings to separate my lane from the off-ramp."