Shooters tend to search for the Clearly Written Black and White about issues like handgun transport, open carry, and so forth.
However, they search in vain. The Devil is in the Details and very few of the details are actually written down any where. When they are written in the law, they vary all over the jurisdictional maps, with inconsistency and confusion being the only constant.
Other significant variables are (a) the arresting LEO, (b) the LEOs superiors (who may or may not push the violation), (c) the prosecuting attorney's office and case backlog, (d) your lawyer's skills and knowledge, and (e) the judge.
Wish it weren't so. But it is.
Best case is to do the maximum: unload everything, break the handgun down into components, lock everything in a locked and inaccessible place, like the trunk. And keep the ammunition both separate and locked.
And get a CHP. Open carry is a Fine Theory. [But......You will meet a lot of LEOs whose excitement level is heightened and whose hands are right close to those Glock .40S&Ws. And you might well eat some gravel before it's all straightened out.]
Anything less increases the risk to the Shooter.