A newspaper story and info regarding an integrated network of 160 or so signals in the Meadowlands region.
http://www.nj.com/bergen/index.ssf/2014/10/traffic_signals_have_sped_up_meadowlands_traffic_even_on_17_officials_say.html#incart_river
http://masstr.njmeadowlands.gov/NJMC%20MASSTR%20Overview%20-%20Jan%202014.pdf
I believe they are setting up a similar-type system in South Jersey along Routes 130 & 168 around the 295/76/42 construction area. From what I can tell though, it doesn't appear to be online as of yet.
Quote from: jeffandnicole on October 10, 2014, 08:50:36 AM
A newspaper story and info regarding an integrated network of 160 or so signals in the Meadowlands region.
http://www.nj.com/bergen/index.ssf/2014/10/traffic_signals_have_sped_up_meadowlands_traffic_even_on_17_officials_say.html#incart_river
http://masstr.njmeadowlands.gov/NJMC%20MASSTR%20Overview%20-%20Jan%202014.pdf
I believe they are setting up a similar-type system in South Jersey along Routes 130 & 168 around the 295/76/42 construction area. From what I can tell though, it doesn't appear to be online as of yet.
Just remember this: Garbage IN = Garbage OUT.
A major adaptive system like this really requires accurate data to operate correctly. Unfortunately, it can be difficult to maintain stable communications and accurate detection. One flickering detector on a side-street and the system might allocate 80% of the green time to the sub-street and 20% to the major corridor during the PM rush... yeah, not good! At the very least, a lot of safe guards need to be put in place which ends up limiting the effectiveness of the adaptive system.
The intersections along U.S. 1&9T and Route 440 that are impacted by the Pulaski Skyway closure and detour were added to the Meadowlands system to be brought on-line during the closure and detour.
Quote from: tradephoric on October 10, 2014, 11:02:45 AM
A major adaptive system like this really requires accurate data to operate correctly. Unfortunately, it can be difficult to maintain stable communications and accurate detection. One flickering detector on a side-street and the system might allocate 80% of the green time to the sub-street and 20% to the major corridor during the PM rush... yeah, not good! At the very least, a lot of safe guards need to be put in place which ends up limiting the effectiveness of the adaptive system.
Very true, although I would think a staffed monitoring room would be able to override any issues until the problem can be fixed.
Quote from: jeffandnicole on October 10, 2014, 11:32:29 AM
Very true, although I would think a staffed monitoring room would be able to override any issues until the problem can be fixed.
At any given time, 5-10% of the system may be offline due to faulty communications (IE. major storms roll through, radio antenna's need to be adjusted, etc.). Those 5-10% effect surrounding signals so it really turns into 10-20% of the system not running adaptively at any given time. Repeat that scenario with faulty detection. In addition, many of the control rooms aren't being monitored 24/7 so any problems that do arise won't be seen right away.
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fimgick.nj.com%2Fhome%2Fnjo-media%2Fpgmain%2Fimg%2Fnjcom_photos%2Fphoto%2F2014%2F09%2F29%2F-ea8ebdcec8ed9110.JPG&hash=d6ca855539fdb9721956045a8a9307451b22f15b)
In regards to accuracy, the viewing angle of the cameras makes it impossible to distinguish between two closely vehicles. This will lead to inaccurate counts. The system will under-count since the cameras won't be able to distinguish gaps between a line of closely spaced vehicles traveling through the intersection. Here's the concept:
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Fwww.fhwa.dot.gov%2Fpublications%2Fresearch%2Foperations%2Fits%2F06108%2Fimages%2Ffig2_55.gif&hash=916d9024df436a6f3ecc7090a3610303e195c33f)