The highway patrol is investigating a fatal accident that claimed the lives to two Guernsey county teenagers. Troopers say it happened around 5:30 this morning on Interstate 77 in Washington county. Investigators say Dustin Hill and Wayne Phillips, both of Cambridge and both 18-years-old were killed in the accident. Troopers say Hill was driving south on I-77 when he drifted off the road and into the median. The patrol says the vehicle then continued through the median went around a guardrail, went between two bridges and vaulted onto county road 375 which runs under I-77. The crash remains under investigation.