Pennsylvania State Police are investigating a hit and run crash that occurred on interstate 81 northbound by mile marker 180.3. A tractor trailer was traveling in the left lane when the driver merged into the right lane and struck a vehicle. Upon impact the vehicle spun counterclockwise, striking a guard rail and stopping in the left lane. The driver of the tractor trailer left the scene. Anyone with information on the tractor trailer is asked to contact Pennsylvania State Police Dunmore at (570) 963-3156.