Morrisville Unified Development Ordinance - April 2019

Article 5: Development Standards Section 5.8. Access and Circulation 5.8.6. Vehicular Access and Circulation

(F) Internal capture reduction shall be applied before the pass-by trips are calculated.

(2)

Pass-by Trips

(A) Pass-by percentages shall be obtained from the most recent edition of the ITE Trip Generation Manual; (B) Pass-by percentages shall only be applied to land uses numbered in the 800s and 900s, using the convention listed in the most recent edition of the ITE Trip Generation Manual; (C) For multi-use developments, pass-by percentages shall be applied to the retail component only. Pass-by trips shall not exceed 10% of the total volume on the adjacent street; and (D) All efforts should be made to ensure that upstream and downstream traffic volumes along corridors balance and maintain continuity. If balanced volumes are not attainable, an explanation should be provided. Documentation regarding the balancing methodology should be provided as well. (1) Present signal timings including coordination and phasing shall be used for the existing conditions analysis; (2) Signal timings and phasing can be optimized if multiple Build Improved scenarios are provided, but the recommendation must be based on present signal timings and phasing. The Planning Director may allow optimized timing and phasing recommendations on a case-by-case basis; (3) A peak hour factor of 0.90 shall be applied for all cases except existing traffic when traffic counts have been acquired; (6) Minimum five-second yellow two-second all-red clearance interval and a -2 second lost time adjustment, or the actual timing of any existing signal(s) shall be used; (7) Minimum seven-second green time per phase for left turns or the actual timing of any existing signal(s) shall be used; (8) Minimum green time for through movements as specified by NCDOT or the actual timing of any existing signal(s) shall be used; (9) Base Saturation Flow Rates and Lane Utilization Factors shall be used in accordance with the latest edition of the Highway Capacity Manual. Lane Utilization shall be accounted for when one or more lanes drop less than 1,000 feet from an intersection); and (10) Minimum signal cycle lengths as listed in Table 5.8.6.B.3.j Minimum Signal Cycle Lengths, shall be used: Signal Analysis All signals shall be analyzed. The following assumptions with supporting data are required: (4) Zero right turns on red shall be used for signalized intersections as a worst-case scenario; (5) Type III arrival rate shall be used;

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Morrisville, NC

April 23, 2019

Unified Development Ordinance

Page 5-45