Opinion Our car experts choose every product we feature. We may earn money from the links on this page. Super Cruise's Biggest Problem Is Us Over 380 miles on I-95, Super Cruise drove for 346. It also canceled 25 times, in the process revealing the biggest hurdle for autonomy: unpredictable humans. Car and Driver Traffic flows smoothly until it doesn’t. Sometimes you get a bit of advance warning, a glimpse of flashing blue lights up ahead, or Waze calling out a chunk of truck tire in the road. But most of the time, you’ve just got to react. Like when I’m on I-95, heading back from a trip to Florida in the 2021 Cadillac Escalade, and traffic abruptly—and I mean, panic-stop abruptly, and for no discernable reason—slows from 70 mph to roughly 15 mph.