because of their size,(not big,just a lot of leg) most people are
intimidated by them. they are however harmless.
they can have a rather painful nip,but don't bite unless threatened
or squeezed in the hand.
a car sounds like an unusual place to find one,but it would be
possible. they can get into some awful tight places,then seemingly
appear out of nowhere. this could startle a driver,but I would
be more concerned with driving,then do something about the
spider after I stopped the car.
I have handled many of these with no problem whatsoever.
here in the US, they rarely get as big as your hand,but some
species found in Australia can get much bigger.
I wouldn't worry about the spiders,least of all a huntsman.
enjoy the land down under.