Planning Board - 110420 Attachment 1

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Buc-ee’s – Efland, NC 18 6.0 Capacity Analysis Capacity is defined as the maximum number of vehicles that can pass over a particular road segment or through a particular intersection within a set time duration. Capacity is combined with Level-of-Service (LOS) to describe operating characteristics of a road segment or intersection. LOS is a qualitative measure that describes operational conditions and motorist perceptions within a traffic stream. The Highway Capacity Manual defines six levels of service, LOS A through LOS F, with A representing the shortest average delays and F representing the longest average delays. LOS D is the typically accepted standard for signalized intersections in urbanized areas. For signalized intersections, LOS is defined for the overall intersection operation. For unsignalized intersections, only the movements that must yield right-of-way experience control delay. Therefore, LOS criteria for the overall intersection is not reported by Synchro/SimTraffic Version 10 or computable using methodology published in the Highway Capacity Manual. It is typical for stop sign controlled side streets and driveways intersecting major streets to experience long delays during peak hours, while the majority of the traffic moving through the intersection on the major street experiences little or no delay. Table 6.0 lists the LOS control delay thresholds published in the Highway Capacity Manual for signalized and unsignalized intersections, and all capacity analyses are included in the Appendix and are briefly summarized in the following sub-sections. Table 6.0 Level-of-Service Control Delay Thresholds Level-of- Service Signalized Intersections – Control Delay Per Vehicle [sec/veh] Unsignalized Intersections – Average Control Delay [sec/veh] & Qualitative Operational Description A ≤ 10 ≤ 10 Short Delays B > 10 – 20 > 10 – 15 C > 20 – 35 > 15 – 25 D > 35 – 55 > 25 – 35 Moderate Delays E > 55 – 80 > 35 – 50 F > 80 > 50 Long Delays 139