Ordering a citizen out of their vehicle is only lawful if you have reason to believe a crime has been committed. Since I`m not obligated to inform that I am carrying, that would not be a lawful order.
Here's a video and story about a traffic stop where a dumbass thought he knew the law better than the officer. Spoiler alert: it doesn't end well for the driver. Michigan teen's family sues over traffic-stop shooting - CNN.com