Driving on shabbos is also considered ho’tza’ah on the car according to reb Moshe. He wrote this in regard to his shita that we consider the number of cars that drive on a given road to give that road a din of reshus harabim, such as Ocean Parkway in Brooklyn. There were those, such as Rav Menashe Klein who disagreed based on the argument that a car, based on its size, is a reshus hachid and so the drivers are in their personal reshus hayachid and are not considered to be on the road they are driving on. Reb Moshe wrote that a person driving a car is considerd to be using the road he’s driving on and is moving his car through the street and he writes that if he drives 4 amohs in a reshus harabim he’s chayev for being ma’avir daled amos b’reshus harabim. So this is a clear psak from reb Moshe that driving a car is considered ho’tza’ah on the car.
And as to the sheila of whether getting a machine to do something through “speaking to it”, if what the machine does is considered his actions in regard to shabbos the same sheila existed with cars for a long time because the fuel injection is done by a computer and all pressing on the gas does is to send a message to the computer. There should be no difference whether he commands a machine by “speaking” to it or pressing a button.
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