** I support bringing the city center segment from Middle Street to Ala Moana down to street level. ** - Rep. Cynthia Thielen
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The idea of a seamless continuance of commuter travel by train from elevated to street level is an excellent idea.
Except for the fact that streets or roads must be widened to accommodate street level rail.
But is there room to widen streets or roads for the train?
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Now then.  The next alternative is to have a Train/Bus commuter travel.
Which brings us to the matter of traffic congestion buses would encounter
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Traffic Congestion caused by Traffic Lights in some cities in mainland USA is today relieved by controlling and manipulating Traffic Lights based upon volume and direction of traffic with Adaptive Traffic Signal System (ATSS).
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In November 2015, the city DTS planned to test ATSS on city streets around late 2016.  
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Applying the system on the bus route to Alamoana fixes congestion.