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Watch how Corvette Racing's new collision-avoidance radar system works

When it comes to technology used in racecars, we generally expect it to trickle down to production cars, not the other way around. Well, Pratt & Miller has developed a new rear-facing radar that operates in a similar fashion to what we're used to in modern blind spot detection systems, only it is also capable of tracking cars as they approach and relaying vital information to the driver via a large display screen.
The innovative radar system debuted at last weekend's 12 Hours of Sebring for Corvette Racing, and this system makes perfect sense for endurance races like this since the cars sometimes have to drive through the night and in poor weather conditions.
The radar can detect cars even with poor visibility, and uses easy-to-distinguish symbols for the driver to identify.

Fernando Alonso sputters in his Indy test

INDIANAPOLIS — Helio Castroneves and Fernando Alonso kept waiting around Wednesday. Now both international stars have some unfinished business to take care before qualifying for this year's Indianapolis 500. After enduring a rain delay of more than four hours then watching IndyCar regulars turn laps at Indianapolis Motor Speedway for two more hours, Castroneves and Alonso finally made it onto the track — but couldn't quite complete their refresher course. "Happy to be back here because this place is great," Alonso said after posting a fast lap of 218.690 mph — the slowest of the nine-driver evening session. "We were slow because the weather and some of the decisions people made on running time and things like that." He faced a bevy of problems in his first trip back to Indy since an impressive rookie performance in 2017. The rain delay forced organizers into rescheduling the one-day test, moving the rookie and refresher driver time from midday to the evening, cutting a significant amount of practice time for Alonso and the others. And when the green flag finally waved, Alonso's No. 66 car stalled in the warmup lane forcing the two-time Formula One champion from Spain to be towed back to pit lane where his crew worked feverishly to fix an electrical problem while sat in the cockpit. Eventually, he did get out and passed the first of two refresher phases. He'll have to wait until opening practice of the 500 on May 14 to pass the second. "It was frustrating for everyone because it was a brand new chassis and a brand new car, so we expected to run a lot," said Alonso, who drives for McLaren Racing. "If we could have had this at midday, you could work on your issues in the afternoon and then go out again." To put his day in perspective, Takuma Sato, the 2017 Indy winner from Japan, posted the fastest lap of the day at 226.993 mph and Colton Herta was the fastest rookie at 226.108. Castroneves, as usual, was good right from the start and posted a fast lap of 225.565. The three-time Indianapolis 500 winner looked smooth and fast on his favorite track and wasted no time passing the first phase. That much should have been expected from the popular Brazilian, who has recorded seven top-three finishes in 18 Indy starts and will make his season debut May 11 in the IndyCar Grand Prix. The weather and yellow flags prevented four of the five veterans — Castroneves, Alonso, Oriol Servia and JR Hildebrand — from passing phase two. Only Indy native Conor Daly made it.

2021 Jeep Grand Cherokee L vs Big Three-Row Crossovers | Spec comparison

The three-row 2021 Jeep Grand Cherokee L is here, entering an ever-growing segment of big crossovers that Jeep has ignored since the Commander of the late 2000s. Of course, the Dodge Durango has basically been a three-row version of the current Grand Cherokee with Dodge styling and a different interior, so it's not like The Corporate Entity Formerly Known as Chrysler has been without a contender in the segment. Jeep is a stronger brand than Dodge, however, and the three-row midsize segment is stronger than those with two rows (there's a vast sales difference between the Chevrolet Traverse and Blazer, as well as the Honda Pilot and Passport). In other words, the Grand Cherokee L could be a very big deal. It is also, quite literally, a very big deal. As you're about to see, it is now the largest three-row crossover, besting the length, wheelbase and height of even the gargantuan Traverse. There's more to the story than that, however, so we put together the below comparison chart to show you how the new Grand Cherokee L lines up on paper versus the biggest three-row crossovers. That includes the 2021 Ford Explorer, 2021 Kia Telluride, 2021 Hyundai Palisade and 2022 Chevrolet Traverse. This group also represents some of the strongest entries in the segment as well as those we feel are most likely to be considered alongside the big Jeep. To that end, we also included the 2021 Lincoln Aviator in the chart since its base price is actually less than what we anticipate the luxurious, range-topping Grand Cherokee L Overland and Summit trim levels to start.  Engines and drivetrains Note the differences in curb weight here. The Grand Cherokee L has the highest base curb weight of the group apart from the high-lux Aviator, yet its 3.6-liter V6 has the least amount of power and torque. Therefore, it'll be surprising if it's not the slowest in the group. There's of course the Hemi V8 available on the top Overland and Summit trim levels, but again, a hefty curb weight works against it. At 5,330 pounds, the lightest V8-powered JGCL weighs 600 pounds more than V6-power Explorer Platinum and ST models. On the other hand, nothing can touch the Hemi Jeep's towing capacity, and only the 400-hp Aviator betters the Jeep's base V6. Its 6,200-pound towing capacity greatly outdoes the 5,000-pound limits of not only the Telluride, Palisade and Traverse, but most others in the segment as well.