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., .. I I i P, . , ., i ., -. .., I , - I I J .. I I ., 1 , I 1 , .! J J 1 1 ] ] I)owling Associates, IlI1c. =~~~~~- Transportation Engineering. Planning. Research" Education ~~~1~~1' At unsignalized intersections where only the minor street approaches are controlled, most of the major street traffic is undelayed and, by definition, have acceptable conditions. The major street left-turn movements and the minor street movements are all susceptible to delay of varying degrees. Generally, the higher the major street traffic volumes, the higher the delay for the minor movements. The LOS calculation methodology from the Highway Capacity Manual (HCM), Transportation Research Board, 2000, provides a delay value and level of service for each of these minor movements at the intersection. Table I shows the average delay criteria used to determine the level of service at the unsignalized intersections At signalized intersections, the HCM signal operations method is used to determine the level of service, based on City standards. The LOS calculation methodology provides a single delay value and level of service for the intersection as a whole. The method determines an average control delay per intersection for the intersection. The delay criteria for signalized intersection levels of service are shown in Table 2. The LOS calculation sheets for this analysis are presented in the Appendix. Table 1 Level of Service Criteria Unsignalized Intersections Level of Average Delayl Service (seconds/veh) A 0.0 10.0 B 10.1 15.0 C 15.1 25.0 D 25.1 35.0 E 35.1 50.0 F >50.0 I Weighted average delay Source: Highwav Capacity Manual 2000 Traffic Analysis Bernal Commercial Development, Pleasanton Page 5