Yes, it is illegal. But the honda insight looks really inocent, so the cops never bother me with it, but I know a lot of people have gotten tickets for illegal tint. Its another great reason to own a honda. I was pulled over for speeding couple weeks ago going 86 in a 65, and the cop saw the tint, started talking to me about my car, then said he really liked my car, and came back with a ticket for 74 in a 65 a $45 ticket. My license plate cover is also illegal you cant see it from an angle because it has a holograophic insert in it. I have not been pulled over for that in my insight, i was pulled over twice for it in about a week when it was on my civic.
I love my innocent looking insight...