Connecticut State Police said the incident took place around 3:30 a.m., Monday, Oct. 25 near Exit 11 in Newtown.
Responding troopers said the person was transported to an area hospital for treatment.
The roadway was closed for several hours, backing up traffic for at least eight miles, before reopening later on Monday morning.
The extent of injuries was not immediately provided.
This is a developing story. Check back to Daily Voice for updates.
Click here to follow Daily Voice Wilton and receive free news updates.