I just looked on Google maps and I don't see any swamps around those exits, unless it's just a swampy creek, you know, between mile marker 139 and 140?
Haven't a clue. I'm 3,000 miles away...
I believe the location is ENE from Raliegh just south of Rocky Mount. If you look at the route you will see a "river" or creek that travels under the highway.
Sad ending to this story. Prayers for the family.