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Traffic Study <br />Lexington Avenue Reconstruction <br /> <br /> <br />Alliant No. 118-0186.0 16 <br />April 18, 2019 <br />2.3.3 Crash Severity <br />The observed intersection crash rates do not exceed the corresponding critical crash rates. <br />Therefore, the number of reported crashes would not be considered statistically significant. <br />However, it is worth investigating the severity of reported crashes. At the Lexington Avenue / <br />Red Fox Road intersection, 10 of the reported crashes resulted in an injury, while 29 were property <br />damage only crashes. At the Lexington Avenue / Target South intersection two of the eight <br />reported crashes resulted in an injury. At the Lexington Avenue / Enterprise-Big O Tires-Arby’s <br />driveway one of the six reported crashes resulted in an injury. At the Lexington Avenue / Grey Fox <br />Road intersection, four of the 14 reported crashes resulted in an injury. At the <br />Lexington Avenue / Shannon Square driveway, neither reported crash resulted in an injury. <br />Crash severity quantifies how severe the crashes are at a location. The purpose for analyzing this <br />statistic is to identify locations that experience a low crash rate but have a high percentage of injury <br />or fatal crashes. Conversely, locations which have high crash rates and a large proportion of <br />property damage crashes may not warrant as much priority when deficiencies are being addressed. <br />Although crash rates are not statistically significant, the Lexington Avenue / Red Fox Road <br />intersection experienced a severity rate (1.09) slightly below the critical severity rate (1.17) and <br />12 percent higher than the statewide average severity rate (0.97). However, it should be noted that <br />no fatal crashes occurred and only one (1) type A injury crash occurred over the analysis period. <br />2.4 Traffic Operations Analysis <br />An existing traffic operations analysis was completed using Synchro/SimTraffic software to <br />establish a baseline condition to which future traffic operations and alternatives could be <br />compared. Operations analysis results identify a Level of Service (LOS), which indicates the <br />quality of traffic flow through an intersection. Intersections are given a ranking from LOS A <br />through LOS F. The LOS results are based on average delay per vehicle, which correspond to the <br />delay threshold values shown in Table 2. <br />Table 2. Level of Service Criteria <br /> <br /> <br />Description Signalized <br />Intersection <br />Unsignalized <br />Intersection <br />A Free Flow: Low volumes and no delays.0 - 10 0 - 10 <br />B Stable Flow: Speeds restricted by travel conditions, minor delays.> 10 - 20 > 10 - 15 <br />C Stable Flow: Speeds and maneuverability closely controlled due to higher <br />volumes.> 20 - 35 > 15 - 25 <br />D Stable Flow: Speeds considerably affected by change in operating conditions. <br />High density traffic restricts maneuverability, volume near capacity.> 35 - 55 > 25 - 35 <br />E Unstable Flow: Low speeds, considerable delay, volume at or slightly over <br />capacity.> 55 - 80 > 35 - 50 <br />F Forced Flow: Very low speeds, volume exceed capacity, long delays with stop <br />and go traffic.> 80 > 50 <br />Source: Highway Capacity Manual, 2010 Edition, Transportation Research Board, Exhibits 18-4 & 19-1. <br />Delay per Vehicle (seconds) <br />Level of Service