"...we are at a tipping point where they are now going mainstream...
"Cadillac's Super Cruise was top-rated because our testing shows it does the best job of balancing high-tech capabilities with ensuring that the car is operated safely and that the driver is paying attention.
"Our tests were designed to determine how well each system performs, not only at the task of steering and controlling a car's speed but also at helping drivers pay attention...it's a critical distinction because research shows that when these systems are engaged, drivers may pay less attention and become overreliant on the automated steering and speed control.
"The top-rated Super Cruise by Cadillac tries to ensure that drivers stay focused by training a small camera on their eyes that assesses whether they're watching the road. If the system determines that a driver isn't paying enough attention, the driver gets red warning lights on the steering wheel, audible alerts, and/or a vibrating seat before the system starts to slow the car down.
"Whether these systems actually improve a driver's safety remains to be seen..."
"[Tesla's] Autopilot and [Cadillac's] Super Cruise were the clear winners. These systems accelerated and slowed comfortably and were able to reliably keep the vehicle centered in the lane for several miles at a time.
"Testers evaluated how easy it was for drivers to engage the systems and make adjustments to settings. They also reviewed the types and amount of information that were displayed to drivers—and how clear it was for drivers to see.
"CR found that it's easy to engage Tesla's Autopilot and that it's clear to drivers whether the system is on or off. It has a unique display that provides the driver with information about what the car's sensors can recognize.
"Cadillac's Super Cruise is the best system at knowing when it's within its operational limits. It can't be used on back roads or in other places where it could be difficult for the car to maintain control. Super Cruise is available only on limited-access highways that GM has already mapped, and if it cannot be engaged, it lets the driver know why. Super Cruise is the only system that provides ample warning to the driver as it approaches merging lanes, off-ramps, and difficult traffic patterns.
"On some secondary roads, Tesla's Autopilot limits how fast the car can go but still allows the system to be used. It even allows use on small, curvy roads with poor lane markings—and operates erratically in these situations rather than locking the system out.
"None of the other systems we tested use eye tracking; rather, they prompt the driver to hold on to, or apply pressure to, the steering wheel. This is an insufficient way of measuring driver attention, and it provides little assurance that the driver is even awake."
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