The drivers of two trucks were seriously injured Tuesday morning when involved in a head-on crash along SR309 in Lynn Township. The crash occurred near 7:30 a.m. just north of the intersection with SR143. A pickup truck was discovered sitting in the south bound lanes facing north and a sport utility vehicle resting against a wood frame structure in a parking lot. The two drivers were extricated from the wreckage of their vehicles and transported to the Lehigh Valley Hospital Trauma Center in Allentown. The four lanes of SR309 were reduced to one lane with fire police alternating traffic. State police at Fogelsville are investigating the incident.