Mass Transit is hidden for more or less the same reason as Fictional—this is primarily a road forum, and we don't want people joining solely to post about transit. We also don't want to attract a contingent of "No roads! Only transit!" posters.
I mean, we've got plenty of "No transit! Only roads!" people...
...which wouldn't be good on a transit forum. Similarly...
The transit and anti-car people are a fairly well-united group. If and when they find out about this group, expect one of them to relay to the others about the group, and if approved you'll notice a lot more "transit/bikes/peds good, all roads everywhere suck" posts if their request for membership is approved.
As far as that unity, I figured this out firsthand one day. I was sitting in a parking lot by an intersection I'm frequently driving thru, and there was a traffic-counter person there. Watching her for a few minutes, I noticed every time a bicyclist would ride by, she made a note on her clipboard. And then I noticed the bicyclists. Dozens of them in just a short period of time. In an area where I can't recall any before, and haven't really seen any since (maybe the occasional bicyclist, but certainly nowhere near the volume that was going thru this day).
Clearly, what was happening was there was some sort of study to determine if there should be bicycle lanes in the area. Someone in the bicycling community found out, shared it with the other members of the community, and many of them took the time to drive to the area, unload their bikes, and would make runs thru the intersection. From what I remember, they almost all went straight, so they were simply going down the road for a bit, making a u-turn, and would come back.
I don't know what the eventual purpose of this was...no improvements have been made to the intersection since I witnessed this (and it's been several years), and there's nothing on NJDOT's plans to make improvements to this particular area.