NJ 129 is a short north/south route in Trenton that connects the NJ 29 expressway to the Trenton Freeway (US 1). It begins at Lamberton Road as what is effectively a long ramp that merges with the ramps from NJ 29 to form a four-lane divided highway. There are traffic lights at all intersections, but there are also overhead green signs as if it was an expressway. After a couple of miles, it merges into the Trenton Freeway (US 1) and ends.
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