Not really. A passenger can see surroundings and adjust when they talk to the driver, and it's easier for the driver to tell them to be quiet when they need to concentrate more. Also speaker phone driving usually involves fiddling about with phone angles, adjusting volumes, "sorry I can't hear you very well, one sec.... is that better?" etc etc. Not the same as a passenger.
Not really. A passenger can see surroundings and adjust when they talk to the driver, and it's easier for the driver to tell them to be quiet when they need to concentrate more. Also speaker phone driving usually involves fiddling about with phone angles, adjusting volumes, "sorry I can't hear you very well, one sec.... is that better?" etc etc. Not the same as a passenger.