Durham authorities Friday morning closed Garrett and Pickett roads near their intersection because of damage to a natural gas line, and they said expected the area to be affected through the day.
Garrett Road was closed north of Cottonwood Drive, and Pickett Road was closed east and west of Garrett Road as repairs began.
A spokeswoman for Public Service North Carolina, which owns the pipe, said a construction crew punctured a 6-inch gas line. Repairs will take unusually long because of the size of the pipe, she said.
For comparison, a typical residential neighborhood would have gas delivered by a pipe of about 2 inches in diameter.
Firefighters said they expected repairs to take eight to 10 hours. The break happened at about 9 a.m.
Fire Deputy Chief Chris Iannuzzi said officials would allow cars past Cottonwood Drive for a graduation planned at Cresset Christian Academy on Garrett Road.