I was there in march en route to Richmond. As most have commented, there's reason to be causally aware of the sand, etc, along the road. But, beyond that, it's awesome. Drivers are usually pretty good - I can't remember the speed limit right off, but in my experience there, no one uses NC 12 as a major highway (generally speaking, anyone driving along the OBX is out for a scenic drive.)
(One point of Caution though: The bridge leading into/out of Kitty Hawk is one were you're going to want to stay AWARE. If I remember correctly, the shoulder is large leaving Kitty Hawk, than coming in (I was heading out.) It's not something to avoid, just stay alert as you come across: it's a long bridge. In April the traffic maybe steady.)
I think you'll really enjoy yourself.