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(A) Level of Service as a Measurement of Adequacy
Although other measurements may be considered, the primary measurement of adequate public facilities for roads is the level of service (LOS) as defined by the most current edition of the Highway Capacity Manual. The required level of service and how it is measured is set forth for different zones under Section 3.23.3(C) below. Level of service is measured at peak hours within the study area or as modified. Should the existing level of service fail to meet the requirements of the peak hour level of service as defined within each zone, there cannot be an increase in average delay for the affected intersection (measured in its entirety). No increase in delay time will be allowed for signalized intersections with a level of service below the requirement within each zone.
(B) Measuring Non-Signalized Intersections
Additional traffic generated from a proposed project may result in a non-signalized public road intersection within the study area to fall below the desired level of service. The primary solution for improving these intersections is to install a signal; however, it is not the intent of this Part to require signals to be automatically installed at all non-signalized intersections that fail (e.g., some intersections may have low volumes or may be located too close to existing signals). Staff may use additional analysis to determine if a signal is required (e.g., gap analysis). Installation of new signals shall only be required when the following conditions exist:
(1) The intersection meets required warrants for a signal; and
(2) The signal does not cause an undesirable delay in the surrounding road system.
(C) Establishments of Transportation Zones and Level of Service
Two Transportation Zones have been established for the purpose of evaluating transportation impacts and assessment of transportation development fees. The official map of Transportation Zones is on display and is available in the Engineering Department.
(1) Central
This zone encompasses all land 400 feet or more away from the innermost right-of-way boundary of Maynard Loop. This includes all of the downtown area. This zone's primary focus is to encourage redevelopment and infill. The Level of Service standard is "F" with a traffic analysis based upon a 90-minute average peak and a roadway volume-to-capacity ratio not to exceed 1.25.
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(2) Base Benefit Zone
This zone contains the remainder of the area not within the other zone. The Level of Service standard is "D" with a traffic analysis based upon the standard ITE average peak hour.
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Cary, NC Land Development Ordinance On-line VIC Version - This site last updated 3/4/2008
Note: This is not the official version of the Cary Land Development Ordinance