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Sheldon H.S. Traffic Operations <br /> Sheldon High School currently uses five buses, the largest having a wheel base of 50 feet. Four <br /> small buses provide service for students in special education programs. The fifth bus is used for <br /> service to the Coburg area. Buses enter the site at the east access and exit via the one way <br /> entrance aisle at the west access. This route is used to keep bus travel on roadways with thicker <br /> paving sections. The principal indicated traffic operations have not been compromised by the few <br /> buses traveling this route. Figure 2 illustrates the existing accesses, on -site circulation, pedestrian, <br /> bicycle, and parking facilities. <br /> ANALYSIS AND EVALUATION <br /> Access Evaluation <br /> The east and west site accesses were evaluated to determine if improvements at these <br /> intersections would improve on -site circulation and overall safety. Vehicle queuing and level of <br /> service at the accesses were of particular interest in this analysis. <br /> Vehicle queuing was observed at the east and west accesses during the morning, lunch, and <br /> afternoon periods. Queues approaching 250 feet were observed on -site at the east access <br /> approximately ten minutes after school dismissal. This queuing is primarily created by the delay <br /> to vehicles making left turns from the school access onto Willakenzie Road. No significant . <br /> queuing problems were observed at the west access as the four -way stop controlled intersection <br /> allows for alternating assignment of right -of -way for both through vehicles and vehicles exiting <br /> the campus. <br /> Level of service (LOS) describes the quality of traffic flow at an intersection. It is based on either <br /> vehicle delay or the volume /capacity ratio and is classified by a letter scale from `A' to `F'. LOS <br /> `A' represents optimum operating conditions or an average delay of less than 5 seconds per <br /> vehicle. LOS `F' indicates over capacity conditions causing more than a 45 second delay per <br /> vehicle. LOS `D' is considered the minimum acceptable level of service. Roadway or intersection <br /> improvements are often necessary when the level of service is below `D'. <br /> Branch Engineering - Page 3 <br />