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b. Intersection Vehicular Analysis
<br /> Individual intersections can perform poorly during peak periods while the overall
<br /> roadway corridor is operating with an uncongested daily volume to capacity ratio lower
<br /> than 1.0. Therefore, capacity analyses are performed for the study intersections to
<br /> determine if they need improvements such as turn lanes or an upgrade in traffic control.
<br /> The existing and forecasted turning movement volumes along with the existing
<br /> intersection configurations and traffic control were used to develop the average delay
<br /> per intersection in each study scenario. The delay calculations were done in
<br /> accordance with the Highway Capacity Manual, 6th Edition using the Vistro software
<br /> package. The full calculations for each study scenario, including Level of Service (LOS)
<br /> grades and queue lengths, are included in the Appendix. Also, included in the Appendix
<br /> is a guide explaining the Level of Service grade concept.
<br /> Chart 2 shows the average peak hour delay per traffic signal-controlled intersection for
<br /> each study scenario. The LOS D/E boundary of 55 seconds of delay per vehicle is
<br /> considered the threshold between acceptable and unacceptable traffic signal operation
<br /> in Minnesota. In peak hours, the optimal range for an intersection to be in would be
<br /> LOS C or LOS D. Operations of LOS A or LOS B in a peak hour signify an intersection
<br /> may have excess, unneeded capacity.
<br /> Based on the Institute of Transportation Engineers' (ITE) recommendation of updating
<br /> traffic signal timing plans every three to five years, the signal timing plans used in the
<br /> future year analyses were optimized to best accommodate the forecasted traffic
<br /> volumes. That optimization actually results in a decrease in intersection delay in the
<br /> a.m. peak hour for future scenarios compared to the existing scenario.
<br /> Chart 2 — Peak Hour Delays: Signal Controlled Intersection
<br /> 60
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<br /> ■Existing 2024 2039
<br /> Traffic Study 7 • . CONSULTING
<br /> PequotLakes
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