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Category > Engineering Posted 09 May 2017 My Price 3.00

A pretimed four-phase signal has critical lane group

A pretimed four-phase signal has critical lane group flow rates for the first three phases of 200, 187, and 210 veh/h (saturation flow rates are 1800 veh/h/ln for all phases) The lost time is known to be 4 seconds for each phase. If the cycle length is 60 seconds, what is the estimated effective green time of the fourth phase?

 

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Alpha Geek
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Status NEW Posted 09 May 2017 10:05 AM My Price 3.00

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file 1494326344-Answer.docx preview (125 words )
A----------- pr-----------eti-----------med----------- fo-----------ur------------pha-----------se -----------sig-----------nal----------- ha-----------s c-----------rit-----------ica-----------l l-----------ane----------- gr-----------oup----------- fl-----------ow -----------rat-----------es -----------for----------- th-----------e f-----------irs-----------t t-----------hre-----------e p-----------has-----------es -----------of -----------200-----------, 1-----------87,----------- an-----------d 2-----------10 -----------veh-----------/h -----------(sa-----------tur-----------ati-----------on -----------flo-----------w r-----------ate-----------s a-----------re -----------180-----------0 v-----------eh/-----------h/l-----------n f-----------or -----------all----------- ph-----------ase-----------s) -----------The----------- lo-----------st -----------tim-----------e i-----------s k-----------now-----------n t-----------o b-----------e 4----------- se-----------con-----------ds -----------for----------- ea-----------ch -----------pha-----------se.----------- If----------- th-----------e c-----------ycl-----------e l-----------eng-----------th -----------is -----------60 -----------sec-----------ond-----------s, -----------wha-----------t i-----------s t-----------he -----------est-----------ima-----------ted----------- ef-----------fec-----------tiv-----------e g-----------ree-----------n t-----------ime----------- of----------- th-----------e f-----------our-----------th -----------pha-----------se?----------- Â-----------  -----------Ans-----------wer-----------: ----------- Ca-----------lcu-----------lat-----------ion----------- of----------- fl-----------ow -----------rat-----------e i-----------n f-----------our-----------th -----------pha-----------se -----------= ?----------- Vc----------- = -----------200-----------+18-----------7+2-----------10+-----------x =----------- 59-----------7+x----------- tL----------- =----------- 4 -----------s =----------- lo-----------st
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