1994 06-20 CCP - Laserfiche WebLink

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Memorandum May 19, 1994 Page 4 peak hour. If the amount of cross -over traffic between the Wal-Mart and Fontana sites is greater than our estimate, we do not anticipate that this will cause a worse level of service. The southbound through traffic will have a substantial amount of green signal time to cross the intersection while the southbound left turns are taking place. Likewise, the northbound through movements will also have their own green time to cross the intersection while the heavy northbound right turn movement is taking place. The northbound through movements will reduce the amount of right -turn -on -red movements by cutting off access to the outside right turn lane. The extreme curve of the Wal-Mart driveway just inside the site makes this somewhat difficult to correct, but it is possible to solve this problem when the outlots along the east side of the site are proposed for development At that time, the outlot(s) could be modified slightly to allow extending the widened portion of the driveway to the south. This. would allow drivers to get into the outside right turn lane sooner, where they would have a better chance of making a right -turn -on -red without being blocked by the through movements which need towait for the green light. Fontana Square 1996 Analysis The traffic analysis provided by Fontana analyzes the scenario required for the environmental assessment worksheet (EAW), which is the timeframe of one year after development of the project. In this case that is estimated at 1996. The analysis therefore must include existing traffic, projected traffic resulting from approved development in the vicinity, and projected traffic fromthe proposed. project. This is the scenario provided in the May 11 memo from BIKO Associates. We did not ask the developer to provide a 20-year forecast because this has been completed in the studies described above. We have reviewed the assumptions and the analysis provided in the BIKO Associates report as well as previously prepared Highway Capacity Manual Intersection Summary worksheets to determine whether there are any concerns with the analysis. Our only concern is that it appears there has been some double counting of the cross -over trips between the Wal-Mart Site and the Fontana Square site, resulting in a volume of trips •entering and exiting the site which is approximately 140 cars higher than the trip generation in the p.m. peak hour. We expected that the cross -over traffic would reduce the amount of other movements of traffic entering and exiting the site rather than leaving them the same. Since the method used by BIKO Associates provides for a worst case situation for the 1996 scenario we do not recommend reanalyzing these figures. Level of Service Analysis A level of service (LOS) analysis identifies the relationship between the amount of traffic and the number of lanes at an intersection. Another important factor is the volumes of the "critical movements," which are those, movements which cannot occur at the same time. For example, westbound left turn movements and eastbound through movements cannot occur at the same time. The type of traffic control is another factor in the LOS analysis. Two-way stop control, four-way stop control and signalization require different types of analysis.