[DouglasKC]

Yup...as many others said they are there from newspaper delivery people. Different papers use different reflectors to know who to deliver to without having to constantly check addresses. Speeds up delivery for those who are paid by how many papers they deliver.

[rawhide]

Hmmm, I do not get any newspaper, but come to think about it, I get Barron's and for last couple of deliveries, I have found it in my driveway, instead of mailed to me and put into my mailbox by the postman. That may be it?