 95 southbound closed at exit 5 after a crash. An overturned tractor trailer performed midnight around exit 4 in the southbound lane near Cos Cobb. So traffic being diverted off the highway onto the post road. Heavy traffic on the post road and traffic on 95 is backed up to Darien and then off the highway. On the northbound side of 95, heavy traffic coming into exit 3 to the Mayanus River Bridge.