Try and try until you die, is not what most people would advice. In this case, however, startup Comma.ai is probably close to calling it quits. After being hit by questions and blocks from both the US NHTSA and the California DMV, Comma.ai decide to ax its Comma One device plans. That driver assistance system, however, could live on as the company has just made the software and robotics platform that powered its plug-in system for others to test on their own. Whether that will prove the agencies’ safety concerns to be well-founded remains to be seen.