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CENTERVILLE RD (CSAH 21/CSAH 59) AT ASH ST (CR J)/WILKINSON LAKE BLVD PAGE 16 ICE REPORT S.A.P. TBD WSB PROJECT NO. 2988-080 CITY OF LINO LAKES, MN Figure 9: Level of Service Guidelines Synchro / SimTraffic and RODEL software were used to simulate existing and future traffic operations at the intersection of Centerville Road (CSAH 21/CSAH 59) at Ash Street. Synchro is a macroscopic software application used for optimizing traffic signal timing and performing capacity analysis of roadway networks consisting of stop, yield, and signalized traffic control conditions. The underlying equations are based on Highway Capacity Manual procedures. SimTraffic is a microscopic software application that performs simulation and animation of vehicular traffic based on Synchro inputs. SimTraffic follows individual cars and uses a wide variety of variables (including some random variables) to simulate real-world driver behavior. RODEL is a software program that predicts the traffic performance of roundabouts. The capacity estimates are based on research completed at the British Transport and Road Research Laboratory (TRRL) and use empirical equations originally published in 1980. RODEL calculates the capacity of each roundabout entry as a function of the circulating flow past that entry and six other geometric parameters. An important feature of RODEL is the capability to vary the evaluation confidence level, which provides a factor of safety that takes into account the variability of traffic predictions and flow characteristics. RODEL, however, is not able to model the interaction of traffic in a system of intersections. Traffic operations at the intersection of Centerville Road (CR 21/CR 59) at Ash Street (CR J) were evaluated using traffic volume for: existing (2016) conditions; 2018 no-build and build conditions, and; 2038 no-build and build conditions, discussed previously. Analysis was conducted for each traffic control option including: all-way stop control (existing conditions); traffic signal control, and roundabout control. A discussion of the assumptions and analysis results is discussed below. 80 55 35 20 10 LOS A LOS B LOS C LOS D LOS E LOS F Not CongestedCongested50 35 25 10 LOS A LOS B LOS C LOS D LOS E LOS F Not CongestedCongested15 Signalized Intersection Un-signalized IntersectionControl Delay per Vehicle (sec.)Control Delay per Vehicle (sec.)SOURCE: Level of Service thresholds from the Highway Capacity Manual. K:\Traffic\Level of Service (LOS)\LOS Delay Graphic.ppt