A driver was injured today when a tanker truck carrying portable toilets overturned along Interstate 440 in Raleigh. The crash was reported before 5 a.m. when the Wall Recycling truck flipped over, blocking the ramp from I-440 westbound to Interstate 87 northbound. According to Raleigh police, the driver suffered a broken leg and was sent to the hospital. He was the only one involved in the crash.