Laserfiche WebLink
the intersection capacity analysis involved a transportation <br /> planning approach. The number of arterial lanes required to accommodate <br /> * <br /> the directional design hourly volume (DDHV) was determined. <br /> The High Flow Arterial Concept Feasibility Study completed by <br /> the Orange County Transportation Commission examined several high volume <br /> intersections in Orange County. The study disclosed that 70-80 percent <br /> of traffic approaching a signalized intersection is thru traffic which <br /> L receive 35-40 percent of the green time. <br /> From this information, an intersection capacity was estimated <br /> for thru and right turn traffic. This capacity is based on actual <br /> experience at Main/La Veta where flow rates equivalent to 1,700 vehicles <br /> L per lane per hour of green were observed. A theoretical approach <br /> capacity of 750-800 vplph was used in conjunction with SATC/TSIP Model <br /> forecasts of the DDHV to predict intersection capacity. <br />P ~ Table 15 presents results of arterial capacity analysis <br /> showing the forecasted DDH/ compared with the current peak hour volume <br /> and the number of arterial lanes required to satisfy the demand. In the <br />, 4 <br /> I - case of Main Street and La Veta Avenue, a curiosity is noted with <br /> respect to a significant difference in the directionality of the DDHV <br /> flows. This situation is partially created by the construction of a new <br /> off-ramp directly into Fashion Square which eliminates the necessity to <br /> use Main Street northbound from the Santa Ana Freeway. A similar <br /> situation occurs on La Veta Avenue where inbound traffic from the <br /> southbound Santa Ana Freeway can use eastbound La Veta Avenue (from <br /> Bristol/La Veta off-ramp) and return using eastbound La Veta Avenue to <br /> the La Veta Avenue on-ramp. <br /> In addition to the arterial lane requirements shown in Table <br /> 15, a center median is reconnended on Main Street with sufficient width <br /> to accommodate dual left turn lanes and a future mass transit guideway. <br /> The capacity analysis for Main Street indicates something less than 8 <br /> lanes may be sufficient to satisfy thru traffic requirements, but it is <br /> 97