Route 33 and US 130 pass through a wooded area with several business lining the route before entering East Windsor Township, where Route 33 splits off of US 130 onto the two-lane Mercer Street. The road passes through woods before emerging into Hightstown, where it serves several businesses and bisects a cemetery before entering the downtown area. Here, Mercer Street ends, and Route 33 runs northeast along Main Street before turning right onto Franklin Street and coming back into East Windsor Township. The route widens to four lanes as it passes under the New Jersey Turnpike (I-95) and becomes a divided highway, reaching an interchange with the Route 133 freeway, which serves the turnpike.