What "land remains"? We are talking about damaged roads. If a flood washes away the roadbed or an earthquake splits the highway, they are as badly damaged as the section of highway 12. You are making a distinction without a difference.
Migrating sand bars get washed away, with the barge pumping new sand in to pave over, you are just putting in a temporary fix.
You keep saying that as if it happens multiple times a year. Tell me, when was the last time highway 12 had to be fixed because a new inlet was formed?
No, the roadways in the west are ok to repair when damaged by earthquakes,
Uh, yea.
The people that live on the sandbar can just ride a boat anyhow. If it's good enough to transport the kids across the Sound to school every day, it ought to be good enough for the parents to take to the grocery store.
No kids ride a boat from Hatteras village to school.
And now I see you do want to leave the area isolated. I wish you'd make up your mind