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Hot lapping Detroit's Belle Isle in a McLaren 12C GT3

Last weekend's Indianapolis 500 was indeed the most prominent race of the 2014 IndyCar series so far, with driver Ryan Hunter-Reay winning in what was an incredibly close fight to the very last lap. But the Indy 500 doesn't mark the end of the IndyCar season, and this weekend, the series heads to Detroit for the Belle Isle Grand Prix – an event that brought open-wheel racing back to The D in 2012 (to admittedly terrible results). But this weekend's Belle Isle events aren't just about IndyCar. In fact, there's a whole host of racing to be found on the small island in the Detroit River this weekend, including the Pirelli World Challenge competition, which many folks love, if only because the racecars are actually based off of production vehicles. As part of this week's pre-race festivities, Autoblog multimedia director Adam Morath got to meet with the folks from K-Pax Racing and check out their McLaren 12C GT3 racer. Morath got strapped in and was told to hang on to his five-point for a memorable hot lap of Belle Isle in the 12C GT3, and he captured the experience on video. Scroll down to check it out. Motorsports McLaren Coupe Racing Vehicles Performance Videos detroit grand prix

McLaren ceases production of 12C to focus on 650S

If you raised an eyebrow in suspicion when McLaren insisted its new 650S would join its lineup in tandem with – and not as a replacement for – the MP4-12C, we're with you. The 650S is, after all, based closely on the 12C, distinguishing itself essentially with a revised shape, updated equipment and more power. And with the Spider version having debuted alongside the coupe in Geneva, there's really little room left for the 12C at all. Keeping both around at the same time would be like if arch-rival Ferrari offered both the old California and new California T (or the 360 Modena and the F430 that followed) at the same time. Yet McLaren has remained adamant that the 12C isn't going anywhere despite the arrival of the 650S. Or is it? Well, yes and no. Reports coming in from the UK indicate that, while McLaren will continue to offer the 12C to customers who order it, the company has actually ceased production of the older, less expensive version for the time being in order to gear up for producing the newer 650S. Keeping both models on the order sheet will likely cease once McLaren's upcoming entry-level model, dubbed P13, comes along. Essentially replacing the 12C with the 650S at that point will allow Woking to open up a bigger price difference between it and the new model, helping to differentiate between the two. In the meantime, the House that Bruce (or Ron) Built appears to be taking a similar approach to Pagani, which kept the Zonda on offer long after the Huayra came along.

Weekly Recap: Autonomous driving goes commercial in Nevada

Nevada granted Daimler Trucks North America the first license to run an autonomous commercial vehicle on public roads in the United States Tuesday, marking another milestone in the technology's rapid advancement. Gov. Brian Sandoval and Daimler truck chief Wolfgang Bernhard promptly used the license to lap Highway 15 near Las Vegas in a newly revealed Freightliner Inspiration Truck. It was a clear signal that autonomous driving is big-rig reality, though it's still a long way from widespread use. Nevada certified two of Daimler's Freightliner Inspiration Trucks, which use the company's Highway Pilot system with a stereo camera, radar, and lane-keeping collision-prevention features to regulate the brakes and steering. The radar component has a long-range sensor that can cover 820 feet at an 18-degree angle and a shorter-range unit that stretches 230 feet at a 130-degree angle. The Inspiration trucks are based on the existing Freightliner Cascadia Evolution model used on US roads. In addition to the autonomous technologies, it also has futuristic design cues, including blue lighting in the front and a new hood and grille. While there are only two Freightliner Inspiration trucks in existence, Daimler expects to bring the Highway Pilot system into mass-produced big rigs by 2025, in time to capitalize on the market's predicted growth. The German truckmaker predicts the global hauling market will triple by 2050, and the United States will be a key part of that growth. Trucks carry 69.1 percent the nation's domestic freight tonnage and hauled 9.7 billion tons of freight in 2013, according to the American Trucking Association. Daimler expects autonomous driving to augment this growth, and perhaps evolve the role of the truck driver. Still, the company points out autonomous tech is not meant to replace drivers, but to assist them and relieve fatigue and monotony on long hauls. The driver has to stay in control for passing, in city traffic, and when hooking up the trailer. The company said autonomous driving also offers the potential for improved fuel economy – tests showed a five-percent gain – and lower maintenance costs. Daimler also said the technology could reduce congestion on the road. Much of this is attributable to the constant flow of traffic, which is aided by autonomous driving. While the benefits are becoming increasingly apparent, autonomous technology is still met with skepticism.