Raleigh police said the leak started around 10:30 Thursday night on Rock Quarry Road at Sunnybrook Road.
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Authorities have yet to say what caused the leak; however, they did say it started to leak into a sewer system.
Crews are on scene making repairs and should be finished around 10 a.m.
Those hoping to access I-40 should make a right onto Sunnybrook Road to head into downtown or make a U-turn and take Jones Sausage Road.