CCP 01-11-1999 - Laserfiche WebLink

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4'/,1 Existing PM peak hour turning movement counts were conducted by SEH, Inc. as part of the Universitv of Minnesota Parcel Traffic Studv conducted for the City of Shoreview in September 1997. These existing traffic counts are shown on Figure 5-1. The quality of traffic flow is generally described using a measure called level of service, Level of service (LOS) is described using letter grades A (best) through F (worst), LOS A represents free flow conditions with little or no delay. LOS F represents extremely congested conditions with long delay times, LOS D is generally considered to be an acceptable level of peak hour traffic operations in the Twin Cities metropolitan area. Level of service on an arterial roadway is generally controlled by intersection operations. Intersection LOS is determined by estimating average vehicle delay times and comparing to the following chart: LEVEL OF AVERAGE SERVICE DELAY (Seconds) A Under 5 B 5 to 15 C 15 to 25 D 25 to 40 E 40 to 60 F Over 60 Source: Institute of Transportation Engineers Highway Capacity, 1994. Intersection delay times are a function of the number of lanes at the intersection, the traffic volume and the type of traffic control. These parameters determine the capacity of the intersection. Comparing the volume of traffic at an intersection to the estimated capacity (the volume to capacity or V IC ratio) yields an estimate of intersection delay that can be used to determine level of service. Existing intersection traffic operations are documented in Table 5-2. As shown in the table all of the' study area intersections currently operate at LOS C or better. However, the following intersections movements experience unacceptable delays: . Southbound left turn from Naples Street to eastbound CR J · Northbound left turn from 1-35W west ramp to CR I westbound · Northbound left turn from 1-35W east ramp to CR I westbound WISPARK Rice Creek Corporate Park Draft EIS December 10. t 998 Page 62