Belle Isle's relatively smoother surface has received a provisional thumbs-up after the IndyCar field had its first taste of the re-ground track on Friday. The Detroit circuit has long been notorious for its bumps and surface changes, and in recent years, for being temperamental – two years out of the past five have been marred by lengthy delays due to the surface breaking up Since last year, some of the bumps on the back straight have been ironed out, and while Rahal Letterman Lanigan's Graham Rahal says that there are still plenty of bumps elsewhere, he believes that it's a definite improvement on the past. "It's better," he said. "But it also makes me think that...
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