In Utah these people are excluded from the state's weapons laws, "(g) a nonresident traveling in or through the state, provided that any firearm is: (i) unloaded; and (ii) securely encased as defined in Section 76-10-501." Utah allows loaded handguns in a vehicle under owners control.
A nick name for the FOPA law. It is a federal law upheld by most (but not all) states. Peaceable journey allows a gun owner to travel through states where they do not have a license to carry, without fear of being arrested. Most states require the firearm be unloaded, in a locked box, or out of the driver's reach when they are in the vehicle. In some states the drivers must pass through the state without stopping, and in others only short stops are tolerated.