You are only required to 'display' your endorsement upon request, AND, only when you are CCW. Typically a LEO is given the endorsement but it would be interesting to see the look on a LEO's face when you say 'no, you may not hold it, but you may look at it', it is not a crime to 'fail to comply'. I think I'll try it if I get nabbed in the future.
There is NO statute that requires you to inform a LEO that you are armed. It is no business of a LEO whether or not you are armed, ever. If the LEO wants to know whether or not your are armed, absent any criminal activity on your part, force the LEO to conduct a Terry Search.
If you are being detained for a traffic law violation, your firearm is not relevant to the infraction. Again, if the LEO wants to know whether or not your are armed, force the LEO to conduct a Terry Search.
The LEO will have to justify a Terry Search conducted during a traffic stop for speeding.
Start your recording devices and keep on, keeping on.