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Eugene Water & Electric Board (EWEB) Master Planned Development Appendix B Table B2 Level -of- Service Criteria for Signalized Intersections 6 Level of ll h &rvice A Average Control Delay per P. =A <10.0 B >10 and <_20 C >20 and <_35 D >35 and <_55 E >55 and <_80 F >80 Unsignalized Intersections October 2012 Unsignalized intersections include two -way stop - controlled (TWSC) and all -way stop - controlled (AWSC) intersections. The 2000 Highway Capacity Manual (HCM) provides models for estimating control delay at both TWSC and AWSC intersections. A qualitative description of the various service levels associated with an unsignalized intersection is presented in Table B3. A quantitative definition of level of service for unsignalized intersections is presented in Table B4. Using this definition, Level of Service "E" is generally considered to represent the minimum acceptable design standard. Table 63 Level -of- Service Criteria for Unsignalized Intersections Level of Service Average Delay per Vehicle to Minor Street • Nearly all drivers find freedom of operation. A • Very seldom is there more than one vehicle in queue. • Some drivers begin to consider the delay an inconvenience. B • Occasionally there is more than one vehicle in queue. • Many times there is more than one vehicle in queue. C • Most drivers feel restricted, but not objectionably so. • Often there is more than one vehicle in queue. D e Drivers feel quite restricted. • Represents a condition in which the demand is near or equal to the probable maximum number of vehicles that can be accommodated by the movement. • There is almost always more than one vehicle in queue. E • Drivers find the delays approaching intolerable levels. • Forced flow. • Represents an intersection failure condition that is caused by geometric and /or operational constraints external F to the intersection. I / Kittelson & Associates, Inc. B -3