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The skinny on Delphi's autonomous road trip across the United States [w/videos]

Rolling out of an S-shaped curve along Interstate 95, just past Philadelphia International Airport, the final obstacle between the autonomous car and its place in history appeared on the horizon. So far, the ordinary-looking SUV had traversed the United States without incident. It had gone through tunnels and under overpasses. It circled roundabouts and stopped for traffic lights. Now, on the last day of a scheduled nine-day journey, it was poised to become the first autonomous car ever to complete a coast-to-coast road trip. First, it needed to contend with the Girard Point Bridge. Riding in a rear seat, "I saw that bridge coming, and I thought, 'Oh my gosh, this is going to be a grab-the-wheel moment," said Kathy Winter, vice president of software at Delphi Automotive. The car, an unassuming Audi SQ5 nicknamed Roadrunner, had been well-tested. Back in January, a few inebriated pedestrians fell flat in front of the car during a demonstration in Las Vegas. It was the quintessential worst-case scenario, and the car admirably hit the brakes. More than drunken louts, bridges present a sophisticated challenge for the six radar sensors that feed data to the car's internal processors. Instead of sensing solid objects, radar sensors can read the alternating bursts of steel beams and empty space as conflicting information. "They're a radar engineer's worst nightmare," said Jeff Owens, Delphi's chief technology officer. Girard Point Bridge, a blue skeleton of girded steel that spans the Schuylkill River, might be a bigger challenge than most. Traveling across the lower level of its double decks, the autonomous car's radar sensors had to discern between two full sets of trusses. Cross the Schuylkill, and Delphi's engineers felt confident they'd reach their destination: the New York Auto Show. For now, the sternest test of the trip lay directly in front of them. A Data-Mining Adventure Until that point, the toughest part of the journey had been finding an open gas station in El Paso, TX. Trust in the technology had already been established. The main reason Delphi set out on the cross-country venture with a team of six certified drivers and two support vehicles was to capture reams of data. What better way to do that than dusting off the classic American road trip and dragging it into the 21st century? They did exactly that, capturing three terabytes worth of data across 3,400 miles and 15 states.

Autoblog editors choose their favorite racecars of all time

If you like cars, there is a good chance that you like racecars. There's something about the science and the art of going faster, of competition, of achievement, that accelerates the hearts of enthusiasts. It doesn't matter the series, the team or the manufacturer – there's something about racing that stirs emotions and lifts spirits. It's that way with many of you, and it's that way with our editors. With that in mind, we offer a list of our favorite racecars of all time. Of course, we'd like to hear some of yours in the comment section below. 1970 Porsche 917 Compared to some of the obscure choices by my colleagues, I feel like the Porsche 917 is almost so obvious a pick as to not be worth mentioning. Still, when coming up with my answer, my mind invariably went back to this classic racer – specifically in its blue-and-orange Gulf livery – while watching Le Mans on DVD and later Blu Ray with my dad. Long, low and curvaceous, few vehicles have ever looked sexier lapping a track than the 917. More than just a pretty face, this beauty had speed, too, thanks to several tunes of flat-12 engines over the course of its racing life. In the early '70s, Porsche was a dominant force throughout sports-car competition, and the 917 (shown above at the 1970 24 Hours of Daytona) was the tip of that spear, including back-to-back victories in the 24 Hours of Le Mans. Largely without dialogue or really much of a traditional plot, Le Mans is like a tone poem of racing goodness. While the 917's importance to motorsports history is undoubtedly fascinating, it's still this cinematic depiction of the Porsche racer that draws me in most, especially with the volume cranked. – Chris Bruce Associate Editor 1964 Mini Cooper S How could everyone not be selecting the 1964 Mini Cooper S piloted by Paddy Hopkirk and Henry Liddon? That car, 33 EJB, took the first of British Motor Corporation's four Monte Carlo Rally wins (it should have been five, but French judges got the British Minis [and Fords] disqualified on a technicality regarding headlights... which its own car, the winning DS, was also in violation of). The tiny red car and its white roof beat out Ford Falcons, Mercedes-Benz 300SEs and scores of Volvos, Volkswagens and Saabs. This, along with the several years of dominance that followed, cemented the idea that not only could the tiny, two-tone Mini be a real performance vehicle, but that family-friendly city cars in general could be fun.

2017 Audi S4 switches to turbo power, loses manual

If you dig the understated look of the 2017 Audi A4 but crave more power, then check out the latest S4. The new sport sedan sticks with a V6 but ditches the supercharger in favor of turbocharging to now produce estimated US figures of 354 horsepower and 369 pound-feet of torque. If there's one downside to the upgrade, it's that Audi only plans to offer the mill with an eight-speed Tiptronic automatic gearbox. The 2017 S4 is now quicker than before. The run to 62 miles per hour takes just 4.7 seconds, versus 4.9 seconds for the current sedan to reach 60 mph. The top speed remains at an electronically limited 155 mph, but fuel economy is claimed to be improved with a rating of 31.8 miles per gallon on the European testing cycle. All S4s come with Audi's venerable Quattro all-wheel drive, and it generally operates with a 40:60 front-rear power split. As conditions change, a maximum of 70 percent of the grunt can go to the front or 85 percent to the rear. Handling is also aided by a tweaked suspension that sits 0.9-inches lower than the A4. Beyond the different badges, the latest S4 doesn't visually advertise its prowess. LED lighting is standard, and quad exhausts rest in a new rear bumper with a subtle diffuser. The side mirror housings also get some aluminum-look trim. The interior layout echoes the A4 but with sport seats and a mix of Nappa leather and Alcantara upholstery. Audi's digital instrument cluster is optional and includes an exclusive sport screen among the three views. The new S4 goes on sale in 2016 as a 2017 model. In addition to the lack of a manual, there's no intention of offering the S4 Avant in the US. Sporty and high-tech: the new Audi S4 and S4 Avant September 15, 2015 | FRANKFURT/INGOLSTADT, Germany Audi launches the new S4 and S4 Avant at the IAA in Frankfurt am Main. The top models from the A4 series are ahead of the competition – with intelligent lightweight design, powerful engines, an extensive package of the latest technologies, and 260 kW (354 hp), 0 to 100 km/h (0 to 62 mph) in 4.7 seconds. (The all-new A4 and S4 are expected to go on sale in the U.S. market in 2016. The Avant is not planned for the U.S. market.) "At Audi, we have more than 20 years of expertise in developing our sporty S models," says Professor Dr. Ulrich Hackenberg, Member of the Audi Board of Management for Technical Development.