The route heads northward as Jersey Avenue, passing several fields and ponds, running parallel to US 1.

Paralleling Amtrak's Northeast Corridor tracks to the west, Jersey Avenue passes through a small corporate park in North Brunswick.

[4] Route 91 continues northward along Jersey Avenue, passing through the industrial districts in the southeastern portion of the city.

With the Northeast Corridor tracks nearby, Route 91 intersects with Triangle Road, where it meets a park & ride and the service road to the Jersey Avenue station serving NJ Transit's Northeast Corridor Line.

The highway continues, passing some commercial buildings, before the Route 91 designation terminates at an intersection with Van Dyke Avenue.