This thread discusses unintentional exposure of a handgun under Texas law:
Section 46.035 (f) (3) of the Texas Penal Code
defines what the premises are for the purposes of unlawful carry of a handgun by a license holder.
(3) "Premises" means a building or a portion of a building. The term does not include any public or private driveway, street, sidewalk or walkway, parking lot, parking garage, or other parking area.