Traffic was blocked on Highway 18 east just outside of Zebulon Thursday afternoon after a tractor trailer wrecked and exploded into flames. Earl Stephens was the sole occupant of the vehicle.According to eyewitness reports, the truck was traveling east when it started to drift into the left lane, eventually going all the way across and off the road. A driver who saw the incident said the truck hit a tree and immediately exploded, with flames up to 25 feet or more over the truck’s cab. Pike County firefighters and Emergency Services personnel were on the scene, dousing the fire as quickly as possible. More updates as they become available.