State road workers' mistakes cost taxpayers more than $1 million. About $560,000 in federal funds built tortoise fences along U.S. Highway 95. But the fences were too short to protect the tortoises. And culverts for the tortoises were so poorly designed ... That a tortoise died trying to get under the freeway. State taxpayers shelled out more than $700,000 for repairs. Federal Highway Administration spokesman Doug Hecox