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12-21-2020-WS
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12-21-2020-WS
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<br /> <br /> <br />COUNTY ROAD E & OLD SNELLING AVENUE ICE PAGE 11 <br />WSB PROJECT NO. 011498-000 <br />CITY OF ARDEN HILLS <br />Crash Evaluation <br /> <br />Crash reductions for each type of intersection control were estimated based on the <br />proposed layout and the crash reduction factors from the Federal Highway Administration <br />(FHWA) Crash Reduction Factors and the Minnesota Department of Transportation <br />(MnDOT) Roundabout Crash Reduction Factors. Table 2 shows the projected crash rate <br />and yearly crashes for each traffic control type using the existing traffic volumes. Fewer <br />crashes mean a reduced cost to the local economy in terms of lost productivity related to <br />property damage, injuries, and congestion on local roadways. <br /> <br />Table 2 – Existing and Projected Crash Rates by Traffic Control Type <br /> <br /> <br />Traffic Forecasts <br /> <br />Base year 2018 volumes were used from the Bethel University Traffic Study (SRF, 2013) <br />and forecasted out to year 2038. Based on the City of Arden Hills - 2030 Comprehensive <br />Plan, traffic volumes in the area are projected to rise by 0.5% annually. For future <br />analysis, the 0.5% annual increase in traffic movement volumes will be used in all <br />simulations to determine level of service. <br /> <br />Intersection Capacity Evaluation <br /> <br />Intersection operations are evaluated in terms of average seconds of delay per vehicle, <br />each approach and turning movement for the intersection. The average number of <br />seconds of delay is broken into six ranges assigned letter grades A through F defining <br />each level of service (LOS) as shown in Figure 4. The ranges for unsignalized <br />intersections are narrower than the ranges for signalized intersections. This is because <br />many factors including the intangible factors of driver discomfort and frustration are <br />considered. A one-minute delay at a red light is perceived as being more tolerable than <br />one minute waiting for a gap in t raffic at a stop sign, especially when there are vehicles <br />queued behind. It is generally recognized that LOS D is the lowest acceptable LOS for <br />All-Way Stop <br />(existing)0.68 3.00 <br />All-Way Stop <br />(Metro district average rate)0.34 1.51 <br />Traffic Signal <br />(Metro district average rate)0.52 2.29 <br />Urban Single Lane <br />Roundabout 0.60 0.27 1.18 <br />* Crash reduction factors taken from MnDOT's HSIP Program guidance <br />Crash <br />Reduction <br />Factor* <br />** Crash rate for proposed improvements = (1 - CRF) x (existing CR) <br />Traffic Control Crash Rate** <br />Projected <br />Crashes Per <br />Year
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