The discovery was made shortly after 6:00 a.m. Wednesday on the ramp from the westbound lane of Route 12.
A passing motorist saw white sneakers protruding from a clump of weeds.
Detectives say the body showed evidence of trauma. Initially, police said, it appeared the man had been shot but are waiting the findings of an autopsy to say for sure.
The man appeared to be Hispanic in his mid-20's to mid-30's. He was wearing a gray t-shirt and tan shorts.
Police say he wasn't carrying any form of identification.
So far police haven't received any reports of a missing person or any reports of gunfire overnight.
Investigators believe the man was killed somewhere else and then dumped on the side of the road.
Anyone with information is asked to call police at 610-655-6116.