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time of travel under conditions of traffic load. The definitions are somewhat subjective as they consider human perceptions rather than strict scientific measurement of some physical property or phenomenon. For relatively modern, major arterial, minor arterial, and major collector roads, this concept holds up reasonably well because the traffic density is the predominant factor effecting service level. For older rural roads identified as major collector, minor collector, or local roads, the predominant effect upon perceived ease of traffic may become the alignment, grade and surface condition of the roadway rather than the traffic load. For these roads the measurement of service level becomes a comparison between the time of travel between two points along an existing road to that which might be achieved if the road between the two points were a modern fully improved road. The road system is comparable to the system of branches in a tree; the trunk of the tree corresponds to a major arterial roadway and branches off of that to minor arterials. As the tree branch system successively divides into smaller branches and then to twigs the correspondence is to major collectors, minor collectors and then to local roads. State Highway 026 is a minor arterial roadway. In strict consideration of the tree like roadway network, a very short section of Escalon Bellota Road, the bridge over the Calaveras River, serves as a major collector. From their intersection at the bridge outward along the system, both Escalon Bellota Road and Shelton Road serve as minor collectors. At this time Waverly Road classifies as a local road. Generally, the key step in the analysis required to determine the impact of an increase in traffic load upon a roadway segment is to investigate the performance of intersections during peak traffic load conditions. The key intersection involved with this project is the Escalon Bellota Road - State Highway 026 intersection. Intersection Analysis 1 . Escalon Bellota Road/ SH 026 The peak hour traffic flow on SH 026 occurred during the half hour period between 0700 hours and 0730 hours. During that half hour period 181 vehicles traveled past the Escalon Bellota Road intersection on SH 026. This gives a peak hourly count of 362 vehicles per hour. Of this traffic 80 percent was estimated by observers to be moving westward to Stockton. This gives an average time between west bound vehicles of 12.4 seconds. Because of variations in drivers habits, vehicles tend to 3 1%4W- CONDOR