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407 <br /> August 5,2020 <br /> Mr.Chuck Edwards,PE,District Engineer <br /> Page 2 of 15 <br /> Reference: Research Triangle Logistics Park TIA Supplement <br /> Old NC 86 interchange. The 1-3306 Traffic Capacity Analysis prepared by Kimley-Horn and Associates <br /> recommends that signals be installed at both ramps with an additional southbound left turn lane and an <br /> exclusive northbound right turn lane at the eastbound ramp. The improvements are illustrated in the <br /> attached Figure 7A. The 1-3306A Public Meeting Map (Sheet 2 of 6)from the January 24, 2019 illustrates <br /> improvements at the intersection, but they are not consistent with the recommendations in the Capacity <br /> Report. According to this figure, traffic signals are not being shown at the ramps. A southbound right turn <br /> at the 1-40 westbound on-ramp is shown on the plan as well as a northbound right turn lane and an <br /> additional receiving lane on the 1-40 eastbound ramp. Although there will be two receiving lanes on the <br /> ramp, the plan does not show dual southbound left turns even though the volume of traffic making this <br /> movement is extremely high. The interchange portion of the Public Hearing Map is attached to this <br /> supplement. <br /> Analysis Results and Mitigation Requirements: <br /> Old NC 86 and Waterstone Drive/Rippy Lane Intersection: <br /> All parties are all in agreement that no improvements are required. <br /> Old NC 86 & 1-40 Westbound Ramps <br /> According to the TIA that was completed for Settler's Point, signal warrant analyses were conducted for this <br /> intersection and it was noted that warrants were met for signalization in the no build condition. Due to the <br /> data collection restrictions caused by the Covid Pandemic, the same data were used for the Research <br /> Triangle Logistics Park, so the same results would apply to this study. The section of Settler's Pointe <br /> discussing signal warrants is attached. <br /> As noted in the TIA, we recognize that there is an increase in delay for the westbound approach at the Old <br /> NC 86 intersection with the 1-40 WB ramp. It is not unusual for a minor approach at an unsignalized <br /> intersection to have an unacceptable level of service. According to the NCDOT Congestion Management <br /> Capacity Analysis Guidelines, "a poor level of service on a side street does not always result in a <br /> recommendation for signalization if v/c ratios and queuing are acceptable". The v/c ratio for the westbound <br /> left turn is 0.59 and 0.65 in the AM and PM peak hours, respectively. Based on SimTraffic models, <br /> although there will be delay on the ramp, there is sufficient storage to ensure that traffic accessing Old NC <br /> 86 will be stored on the ramp with no impacts on 1-40. Additionally, it should be noted that the TIA assumed <br /> full build out of Waterstone while the development is only partially built out. Therefore, delay estimates are <br /> very conservative. The U-5845 project will install a signal at this location. <br /> Therefore, based on this additional information, we do not recommend improvements at this location as a <br /> result of the proposed development. <br /> Design with community in mind <br />