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Chad Miller and his three partners, who work in a small suite of offices for The Gravity Group on the outskirts of Cincinnati, decorated with coaster posters and odd leftovers from various projects, crunch the numbers carefully, using their own programs (with names like Splinal Tap) that can turn the squiggly lines of a rough initial design into a more polished one. At regular intervals along the route, the software calculates G-forces — up and down, side to side and forward and back — on riders in the front, middle or back of the car.
Read more and see video from The New York Times.