While a car isn't alive, it can't actively rip your head off, it's not quite as crazy as riding a bug. A Silt Strider is a logistical transport vessel, as well as a people moving mobile. It's also a giant bug.
Native to the lands of Morrowind, they were almost wiped out by a natural disaster, but thanks to the Dunmer (Elves) -- the only ones who want to ride these massive beasts -- they are still alive and carrying everyone's burdens.
Silt Striders are rideable, living bugs, why would you want to use them? Crazy Dunmer! But as they are not hostile; they are not crazier than our next vessel of conveyance, where we move over to the lands of Azeroth -- it will not be the only one either.