Chopper 6 was over the scene of a tractor-trailer accident on I-78 on April 18, 2019.LEHIGH COUNTY, Pa. (WPVI) -- A tractor-trailer crash is causing a traffic mess in the westbound lanes of I-78 in Upper Salcon Township on Thursday.It happened on I-78 near Route 309 around 3:30 p.m. Chopper 6 was over the scene where a tractor-trailer overturned bringing traffic to a standstill.No injuries have been reported. Report a correction or typo