PennDOT and State Police were called to a rock slide along Interstate 79 Wednesday morning. Washington County 9-1-1 says it happened just before 7:30 a.m near mile-marker 44 between Houston and Canonsburg. State Police Washington tell WJPA News that two vehicles were struck by, what they called, boulders. Dispatchers say no injuries resulted. PennDOT says crews removed rock debris and both lanes were reopened to traffic around 8:45 a.m.