Three persons were injured Thursday around noon when two vehicles collided at the intersection of state routes 309 and 143 in Lynn Township, Lehigh County. It appeared the crash occurred as a Subaru station wagon was traveling south on 309 and struck a truck which appeared to be pulling out of 143 onto 309. In all seven persons were involved in the incident with three being injured. Traffic was reduced to one lane of the three lanes at the incident scene. State police at Fogelsville are investigating the incident.