20% of drivers in that area are either ignorant of the law, or willfully breaking it.

I'm going to go with: don't know and wouldn't care anyway.

I was so happy when NJ banned the use of hand-held phones while driving. Now if they could just enforce it. I see at least six people talking on hand-helds in any given mile of road (including, this evening, a cop driving a marked SUV). I especially like it when they're behind me in stop-and-go traffic in the rain, as during this afternoon.