Logano's comical reaction to this decal seen in the window of a pickup truck going down the highway.

When the vehicle has two side mirrors with a view for at least 200 feet to the rear, it's legal to have "any sticker or stickers, regardless of size," on the rear window.

They found the decals - stickers in a reflective material that usually bear a decorative design - are only effective if placed on the outside of the window.

Chinese drivers are sticking reflective ghost transfers on the rear windows of their cars to deter other motorists from using high beam headlights.