I think they give GWB traffic info for commuters heading that way from where they can be heard. I believe the traffic reporter has required roadways & river crossings they must mention in a report & the GWB is one of them.Often amused when NJ101.5 traffc mentions the GWB since if you try to listen in that area, it's a mixmosh of Trenton, Poughkeepsie, and some local pirate station.