California Puzzles Over Safety of Driverless Cars

DMV officials say they won’t let the public get self-driving cars until someone can certify that they don’t pose an undue risk. The problem is that the technology remains so new there are no accepted standards to verify its safety. Absent standards, certifying safety would be like grading a test without an answer key. Broadly, the department has three options: It could follow the current U.S. system, in which manufacturers self-certify their vehicles; it could opt for a European system, in which independent companies verify safety; or the state could (implausibly) get into the testing business.