Tesla Motors Club

We are from the Boston area and do not often travel through New York City, and have only used the Tesla Navigation system for two crossings of the Hudson on the George Washington bridge, one of them yesterday. Going north on a trip from Philadelphia back to our home, the Nav system told us to take the GW Bridge (and Google maps agreed). As we approached the bridge, the system specifically directed us to the upper deck, despite the fact that the electronic message signs along the approaches indicated a longer travel time for the upper deck. Since we are not from the area and aren't familiar with the connections at the end of the bridge, we were worried that we might not be able to follow the directions to the Henry Hudson parkway if we took the lower deck, so we stuck with the Nav system.
Later I wondered if the Nav system can even distinguish between the upper and lower decks in terms of traffic and travel times. Given that I do not know how the nav system gets its traffic data, it seems possible that the nav system can only see the bridge as a whole and not one deck vs. the other, at least for traffic.
Anyone know for sure if the Nav system can indeed distinguish the two levels for travel times? (Apparently it does from a map standpoint.)

(And by the way, it turned out the bridge was a mess and we'd have been better off taking the Tappen Zee bridge as we did on the way down. Next time we will!)