By default you have to continuously press a button to move the car. Also the car has cameras and ultrasonic sensors. You can set thresholds for how close you want the car to get to obstacles. I think the default is 2 feet. The car will refuse to move if it thinks it's too close to an obstacle. I think the top speed is 1 or 2 mph, and the car emits a warning sound as it moves.

I mostly use the summon feature for annoyances such as someone parking too close to me or rain causing a puddle to form around the car.