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Signal Coordination

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					    Signal Coordination Example 1 –
    Textbook Prob. 26-2
N


                       a.    What is the NB Progression Speed?
                       b.    What is the NB Bandwidth and
                             Bandwidth Capacity? Assume a
                             saturation headway of 2.0 sec/veh
                       c.    Find SB Bandwidth assuming same
                             speed as NB progression? What is
                             the Bandwidth Capacity?
                       d.    New development  new signalized
                             driveway to be located between
                             Intersections 2 and 3.
                             Requires 15 sec. of green time.
                             Flexibility to locate intersection.
                             Where would you place it? Why?
    Part (a)

    What is NB Progression
     Speed?
       Check the Diagram
       3,000 ft in 60 sec.
        \50 fps
        \34.01 mph
    Part (b)

   NB Bandwidth and Capacity?
       Check the diagram
       Bandwidth = 30 seconds
       Number of lanes not given
                                      30 sec.
           Find Bandwidth Capacity
            per lane  NL = 1
       Bandwidth Capacity
        =(3600×BW×NL)/(h×C)
        =(3600×30×1)/(2.0×60) =
        900 vphpl
Part (c)

   SB Bandwidth and
    Capacity?
     Check the diagram
                               12 sec.
     Bandwidth = 12 seconds
     Bandwidth Capacity
    = (3600×BW×NL)/(h×C)
    = (3600×12×1)/(2.0×60)
    = 360 vphpl
    Part (d)

   Need to place the
    driveway where
       It does not interrupt
        NB, SB progression
       It has 15 seconds of
        green time
           given info

				
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posted:5/2/2013
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