I had a big long response to your OP but it got lost when I tried to post becase I was logged out. Oh well.The act of driving down the street in itself is not codified as a crime, unless you do not have a valid license. The act of carrying a handgun in public IS codified as a crime, unless you have a LTCH. Besides, you cannot argue about firearms laws by jumping up and down and pointing at traffic law. Most traffic law is infractions and ordinances, and trials are more civil in nature than criminal. Apples and oranges. Both fruits, but quite a bit of difference.
The act of driving on public roadways without a license is a crime.
The act of carrying a firearm in public without an LTCH is a crime.
With a license both are legal. Neither acts should be grounds for detainment unless and actual crime was observed.
ie. turning without out signaling for driving or brandishing a firearm.