Overturned big rig trailer in Hayward on I-880

A big rig's trailer overturned early Friday morning in Hayward on Interstate Highway 880, blocking traffic in the southbound direction and causing a mess for hours. 

The accident occurred north of SR 92 at about 4:30 a.m. and the rig was on the roadway until about 9:30 a.m. 

CHP Officer Kylie Musselman said fortunately, no one was hurt. She wasn't clear what caused the trailer to overturn, but said usually, it's a matter of speed or weather conditions. She added that each truck was carrying 15,000 pounds of packages. 

The rig belongs to XPO, a company that says it provides "world-class transportation solutions." 

XPO has an office in Hayward near the crash site.