If you try to practice Samatha or concentration meditation while driving, it could pose a danger. But Satipattana usually does not lead to trance likes states when there are so many sensory distractions. Because in Satipaththana, we are not focusing on one single object. It's like saying, if you practice walking meditation, you are in danger of walking into a wall. But we know that is not true. Try it in daily life and discover for yourself.