In Dublin, California, near the 580-680 interchange, a negligent driver lost control of his Porsche, hit a Caltrans truck, bounced off, and struck and killed Djuan Bush, age 24, of San Leandro, before striking another truck. Mr. Bush, a Caltrans employee, was hit by the Porsche as he was working on a San Francisco Bay area highway. Signs were posted near the Caltrans guardrail project advising...