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CC_Minutes_2004_1220
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7/17/2007 9:33:04 AM
Creation date
2/17/2006 10:30:35 AM
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Roseville City Council
Document Type
Council Minutes
Meeting Date
12/20/2004
Meeting Type
Regular
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<br />Traffic Analysis <br /> <br />Analysis was completed for each of the baseline scenarios including the years 2004, 2006, and <br />2025, for the weekday P.M. peak hour and Saturday peak hour. Analysis was also completed for <br />each of the build scenarios of the years 2006 and 2025. The analysis was performed using the <br />2000 Highway Capacity Methodology through SYNCHRO, a traffic signal timing software <br />program by Trafficware. Results of the analysis are displayed as measures of effectiveness. <br />Measures of effectiveness display quantitative information about the performance of an <br />intersection or network of intersections. The primary measures that are used in this study are <br />level of service and volume to capacity ratios. A level of service is a letter designation that <br />describes a range of operating conditions for different types of facilities. V olume to capacity <br />ratio is a measure of adequacy of the existing or proposed capacity. <br /> <br />Level of Service <br /> <br />The operational analysis results are described as a Level of Service (LOS) ranging from A to F <br />and these letters serve to describe a range of operating conditions for different types of facilities. <br />Levels of Service are calculated based on the 2000 Highway Capacity Manual, which defines the <br />level of service, based on control delay. Control delay is basically the delay experienced by <br />vehicles slowing down for a signal, the wait tirne at the signal, and the time for the vehicle to <br />speed up and get through the signal. The average control delay is a volume weighted average of <br />all delay from all intersection approaches. Level of service D is commonly taken as an <br />acceptable design year LOS. The level of service and its associated intersection delay for a <br />signalized intersection is presented below. <br /> <br />Signalized Intersection LOS: <br /> <br />LOS Control Delay Per Vehicle (sec.) <br />A ::; 10 <br />B >10 and::; 20 <br />C >20 and::; 35 <br />D >35 and::; 55 <br />E >55 and ::; 80 <br />F >80 <br /> <br />Volume to Capacity Ratios <br /> <br />Volume to capacity is the proportion of the facility's capacity being utilized by the traffic on the <br />facility. This is directly calculated by dividing the total traffic using the facility by the capacity <br />of the facility. This can then determine if a facility is sufficient to handle the traffic that is <br />supposed to be traveling on it. A ratio greater than 1.00 predicts that the facility will be unable <br />to discharge all of the demand arriving on it. Such a situation would result in long queues and <br />extensive delays. <br /> <br />Operations Analysis <br /> <br />All intersections were analyzed with signal timing information received from Ramsey County. <br />The system of signalized intersection on county road B-2 and Fairview are actuated-coordinated <br />traffic responsive. Because the system is traffic responsive optimized cycle lengths were used to <br />PARSDNS Page 21 of 32 Rosedale Mall Expansion Traffic Impact Study <br />Roseville, MN <br />
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