Dan Clerico | For lehighvalleylive.comFour adults were seriously injured Tuesday morning when the SUV they were in collided with a tractor trailer along Main Street in Palmer Township. Police have shut down both lanes of Main Street, from Trolley Line Drive to the Route 33 south exit ramp. Eastbound traffic on Main Street are being detoured onto Van Buren Road or Route 33 south. Traffic from the Route 33 north/Main Street exit ramp is being directed east onto Main Street. Traffic from the Route 33 south/Main Street exit ramp is being directed west onto Main Street.