Absolutely you can take a Nintendo Switch in the car. As mentioned above, there are accessories that allow you to mount the Switch screen on the back of a headrest, creating a little gaming nook in the backseat. Even without those, the Switch is easy to pack into a carrying case and doesn’t take up much space in a backpack. Playing in handheld mode doesn’t require any more space than your body normally takes up in the passenger or back seat, so game away!