2019.08.07 EDC Packet - Laserfiche WebLink

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Traffic Impact Study 12 New Brighton Exchange Update 4. Analyses a. Intersection Vehicular Analysis Capacity analyses are performed for the study intersections to determine if they are operating acceptably or if they need improvements such as turn lanes or an upgrade in traffic control. Analyses were run for the existing scenario as well as the 2033 Build scenario. The existing and forecasted turning movement volumes along with the existing intersection configurations and traffic control were used to develop the average delay per intersection in each study scenario. The delay calculations were done in accordance with the Highway Capacity Manual, 6th Edition using the Synchro/SimTraffic software package. Five simulations, each with a different random seed number, were run for each scenario and the results were averaged. The full calculations for each study scenario, delays and queue lengths, are included in the Appendix. Also, included in the Appendix is a guide explaining the Level of Service grade concept. Chart 1 (a.m. peak hour) and Chart 2 (p.m. peak hour) show the average peak hour delay per traffic signal-controlled intersection for each study scenario. The LOS D/E boundary of 55 seconds of delay per vehicle is considered the threshold between acceptable and unacceptable traffic signal operation in Minnesota. The initial signal timing for the existing conditions was provided by Ramsey County. Based on ITE’s recommendation of updating traffic signal timing plans every three to five years, the signal timing plans used in the 2033 analyses were optimized to best accommodate the forecasted traffic volumes. Chart 1 – A.M. Peak Hour Delays: Signal Controlled Intersections Congested at LOS D/E Boundary (55 seconds) 0 10 20 30 40 50 60 Old Hwy 8 & Hwy 96 Old Hwy 8 & 10th StAverage Delay (seconds)Existing 2033 Build