This seems not just to be rank-and-file cops chafing at orders from their bosses; a dangerous message is coming from the top. When Commissioner Bill Bratton came to our recent Vision Zero Cities conference, we hoped he would outline new strategies to make traffic enforcement more effective and equitable. Instead, we were greatly disappointed to find that he actually had little interest in — or even knowledge about — Vision Zero, which he dismissed as "a nice goal to aspire to," even though in recent years more New Yorkers are being killed in traffic than by guns.