There is no "duty to inform" in the State of Colorado. Do yourself a favor and keep your mouth shut on the issue. Sign your speeding ticket (or Defective Vehicle, or whatever) and you will be on your way in just a few minutes. 

...Or, let the cop know you have a gun and hope that you don't get pulled out of your car, disarmed and put in handcuffs "for your safety and mine."

Do not assume that informing the officer that you are armed is going to get you out of the ticket.