Did you ever have a tree or a tree branch break down in a thunderstorm or snowstorm while you were at work? When you arrive home, you find the unpleasant surprise. Hopefully it is not blocking your driveway so you can at least pull into your parking space or into your garage.
An even worse case scenario other than damaging your house or other property, would be waking up in the morning and realizing your driveway is completely blocked by a tree or limb that broke down in a storm overnight and there is no way to leave for work! If you do not have your own chainsaw you will definitely be late for work as you spend your morning using a hand saw to cut a path to drive through.