If you release the summon button, the car comes to a stop. You are supposed to be able to see the car visually at all times so you can release the summon button and avoid problems.

In addition to stopping when releasing the button, it also shows you the path it plans to take on a satellite map on your phone. So you know where it is going.

Some people have problems with it, but it works great for me. It's pretty awesome to have the car pull up to me on a rainy day. Part of it is parking in a smart place on the way in.