Regardless of state law requiring notification or not, I advise my students to inform the LEO whenever involved in an official encounter initiated by LEO (traffic stop, etc.). From talking to various LEO in various jurisdictions, you will be a lot better off if you inform the LEO that you're armed rather than them finding out and being "surprised".
Specifically in a traffic stop, turn on all interior lights when appropriate (so the officer can see what you're doing in the vehicle). Keep your hands on the wheel, and don't fumble for paperwork or anything else. Open the window approached by the officer a few inches (some officers approach from the passenger side if it's safer to do so). If your windows are heavily tinted, you may want to roll them down a little more. Communicate with the officer and get permission before retrieving paperwork or making any movements. For example, when the officer asks for your license, registration, and proof of insurance, tell the officer where they are located and get permission before retrieving the documents. I keep my CC permits with my driver's license. The officer will get the appropriate CC permit/license along with my driver's license. When retrieving the paperwork, let the officer know wehre it's located and use slow but deliberate movements when retrieving them. Be respectful with the officer and do your best to comply with their instructions.
I've been through at least 2 traffic stops while armed, followed procedure as described above and had no problems with the officers I encountered. Some may argue that the officer will "freak out" and give you more grief than necessary for informing them. From my experience and talking to others who have gone through a traffic stop while armed, it's unlikely that the officer will freak out. If you do get an officer that freaks out, stay calm and comply as best you can. The officer would probably have freaked out for something if you hadn't informed them. Document the facts of the incident as best you can, then follow up with appropriate action AFTER the encounter is over.
Most importantly, DO NOT leave the scene until the officer informs you that you are "free to go". If in doubt, ask the officer "Excuse me officer, am I free to go". Better to be safe than sorry!
Good luck!
That is some good common sense advice. Personally, I prefer to be respectful, obey and polite. Turing on the interior lights (assuming at low light or nite) and keeping your hands on the wheel make perfect sense until asked for your license. Slow deliberate moves are also good common sense. Appreciate you taking the time to reply. Ya know, I have heard from reputable sources BGs being drawn on by LEOs and instructed to keep their hands on thier head, but they still make a move for a weapon. God Lord what is this society coming to. Thats one reason I have a CCW license, albeit newly issued.