With your dignity intact? The guy basically lost all his credibility with this action.

Walking away with dignity intact would be replying to NHTSA, "Dear Government, we've found out we are unable to provide the information you asked for because the product is nowhere near mature enough. Therefore we are officially abandoning all public tests and sales effort, and are going back to the drawing board until such time that we are able to get back to you with the answers you requested."

I think he meant "ego" instead of "dignity". This is how you walk away with your over-inflated ego intact. Behaving this way indicates that you have no dignity.