Rachel Berg, 18, was speeding in her brand-new Chevy Corvette on a Mesa highway about 10:30 p.m. March 12 when she rear-ended a Harley-Davidson being ridden by Michael Clark, 46, a Tempe park ranger... Berg pulled over and tried to perform CPR on the fallen biker but he died at the scene — then told police she couldn’t stop in time before ramming the Hog, AZ Family said. Data from her car’s airbag control module reportedly indicated that she had been traveling at 155 mph five seconds before impact and 87 mph when she struck the bike after slamming on...