Woah, careful there fella. A tiny falling out of a moving car doesn’t stay in one piece very often. That’s why a secured pet carrier is the safest option. Though other containment works as well depending on your preferences.
I am a firm user of terrariums and dollhouses, anything else is temporary like cages or shoeboxes or dresser drawers for sleeping in. I like my tiny lady near me otherwise when possible in pocket(with a protective lining) or riding my shoulder(maybe with a saddle).