If you enjoy looking at the "What is it" vehicles because you are up for a challenge, Prewarcar.com has a catagory to enjoy

http://www.prewarcar.com/my-prewarcar/show-a-pre-war-mystery/

Anyone know what the red letter "I" are about?

maybe these are just some new "thing" like the "Obey" photos of Andre the giant that were put up everywhere around San Diego