Agenda - Council - 09/11/2001 - Laserfiche WebLink

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I I I I I I I I I I I Brian Olson, P.E. - 3 - July 12, 2001 Current traffic controls include signalization at the TH 47/153rd Avenue intersection and side- street stop control at the remaining intersections. SRF Consulting Group collected a.m. and p.m. peak hour turning movement counts in May 2001 at the key intersections. The a.m. and p.m. peak hours for the study area occur between 6:45-7:45 a.m. and 4:30-5:30 p.m. Existing geometrics and peak hour traffic volumes for the key intersections are shown in Figure 2. A traffic operations analysis was conducted for the a.m. and p.m. peak hours at each of the key intersections to determine how traffic currently operates within the project area. The signalized intersection of TH 47/153rd Avenue was analyzed using Synchro. The unsignalized intersections were analyzed using the Highway Capacity Software. Capacity analysis results identify a Level of Service (LOS), which indicates the quality of traffic flow through an intersection. Intersections are g/yen a ranking from LOS A through LOS F. LOS A indicates the best traffic operation, with vehicles experiencing minimal delays. LOS F indicates an intersection where demand exceeds capacity, or a breakdown of traffic flow. LOS A through D are generally considered acceptable by drivers. LOS E indicates that an intersection is operating at, or very near, its capacity and that vehicles experience substantial delays. Results of the analysis shown in Table 1 indicate that the key intersections currently operate at an acceptable overall LOS B or better during the a.m. and p.m. peak hours,, with existing traffic controls and geometric layout. Table 1 Existing Capacity Analysis Level of Service Results Level of Service Intersection = ' A.M. Peak P.M. Peak TH 47/156th Lane* A/C A/C Yakima Street/156th Lane* A/A MA TH 47/153rd Avenue B B Waco Street/153rd Avenue* A/A A/A * Indicates an unsignalized intersection. The overall LOS is shown followed by the worst approach LOS. -141-