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Figure 2 - 5. Guideline for determining the need for a major -road left -turn bay at a two-way stop -controlled intersection. <br />2-lane roadway (English) <br />INPUT <br />Variable <br />Value <br />85thpercentile speed, mph: <br />42 <br />Percent of left -turns in advancing volume (VA), %: <br />9% <br />Advancing volume (VA), veh/h: <br />196 <br />Opposing volume (Vo), veh/h: <br />182 <br />OUTPUT <br />Variable Value <br />Limiting advancing volume (VA), veh/h: 477 <br />Guidance for determining the need for a major -road left -turn bay: <br />Left -turn treatment NOT warranted. <br />CALIBRATION CONSTANTS <br />Variable <br />Value <br />Average time for making left -turn, s: <br />3.0 <br />Critical headway, s: <br />5.0 <br />Average time for left -turn vehicle to clear the advancing lane, s: <br />1.9 <br />Access E - 2045 Scenario 2 NBL <br />800 <br />t <br />700 <br />o 600 <br />500 <br />E 400 <br />� 300 <br />c 200 <br />.y <br />0 100 <br />CL <br />' <br />O 0 <br />warranted. <br />treatment not <br />warranted. <br />0 100 200 300 400 500 600 700 <br />Advancing Volume (VA), veh/h <br />Page 533 of 617 <br />