I'm 6"3' I could not see some of the stop lights if I was first in line, I bought a Lightnsight, I stuck it just to the left of the rear view mirror. Works perfect, now I don't have to peek out the clear roof. I don't know about every state, but in Virginia, many of the lights are not across the intersection, hard to see. The profit margin must be terrific, it is just a strip of flexible plastic, probably costs a few pennies to make in a large volumn. But for me it was a wise expendature.