It is also a great way to quickly check on your neighbors.
You will need to tape the card that represents your situation to your door so it can be seen from the road. This system is recommended by emergency personnel and the color code is known for your local C.E.R.T. personnel as well.
If you need to you can use card stock or any other item to display.
Just make sure that it is obvious that the displayed item (towel, blanket...) is representing your needs.
I recommend keeping your notification cards in an easily accessible area in your home near the front door, and a copy in the back of your Vital records Binder.
You can also keep a copy in your car kit so that you can post if you are away from home.
I have included two links, one is colored and one is black and white to be printed on colored paper.
Here are the links:
