I can't tell. I never thought of the Merritt as north-south, but the stretch leaving the City is. The Garden State Parkway is west of the City and never touches it, so I don't see how traffic on it can be said to be moving in any direction out of it.
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ladybird25Traffic on the Garden State Parkway, the Merritt Parkway, and the New York State Throughway heading north is reported bumper to bumper,I believe the intention is to say this:
ladybird25Now I would like to know the general rule.I don't think there is a general rule. In a sentence like your example, the writer is informing people who know quite a bit about the freeways in question. They would know in which directions these freeways go and would be quite adept at understanding the meaning. We who don't live in the area in question