'Please Knock And Wait' Caution Elderly, Boomers

Door sign in eye-catching red, white and black or cautionary yellow requests guests, delivery people to "Knock & Wait" please, then from familiar government signs an elderly couple with canes and (mobility issues) provide an explanation. It's frustrating if a delivery person gives one sharp rap and leaves before you can get to the door. You can keep this sign up all the time, or just when you're expecting an important visitor or package. "Knock & Wait" door sign can prevent missed connections.