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Article 5: Development Standards
Section 5.8. Access and Circulation
5.8.6. Vehicular Access and Circulation
June 23, 2017
Morrisville, NC
Page 5-44
Unified Development Ordinance
g.
Analysis Scenarios
The analysis shall have a timeframe adequate to address all phases of the proposed
development. Intersections shall be analyzed using the four scenarios in Table
5.8.6.B.3.g:Analysis Scenario Requirements, and shall include queue analysis:
Table
5.8.6.B.3.g :Analysis Scenario Requirements
Type of
Scenario [1]
Existing
Annual
Growth [2]
Approved
Developments
Proposed
Development
Necessary
Improvements
Existing
X
No-Build
X
X
X
Build
X
X
X
X
Build Improved [3]
X
X
X
X
X
Notes:
[1] For a phased proposed development analysis, the build and build improved conditions shall be assessed, and
the traffic associated with each previous phase shall be included in the analysis of each successive phase of the
proposed development.
[2] The Annual Growth rate will be determined in the Memorandum of Understanding (see Sectio
n 5.8.6.B.3.c).
[3] This scenario may be eliminated if improvements are not necessary to satisfy any queuing problems or the
LOS criteria in Sectio
n 5.8.6.B.4.j(2), Recommendations.(Ord. No. 2016-001, 05/10/2016)
h.
Traffic Counts
Traffic counts shall reflect normal and/or peak hour traffic conditions, as determined by the
Planning Director.
(1)
Traffic counts used for analysis shall be collected:
(A)
Within the twelve months prior to the date of the TIA submittal;
(B)
On Tuesday, Wednesday, or Thursdays;
(C)
On other peak periods such as noon or weekend periods, if required; and
(D)
When school is in session. If not practicable, the Planning Director can approve the
use of school traffic estimates.
(2)
Traffic counts used for analysis should not be collected:
(A)
On holidays; and
(B)
When significant weather or traffic incidents occur.
i.
Trip Generation Standards
Trip generation data for each proposed development shall be based upon the ITE Trip
Generation Manual, most recent edition, or another source of trip generation approved by the
Planning Director. In addition to this requirement, the following standards shall apply:
(1)
Internal Capture
(A)
The internal capture calculation shall utilize the percentages from the most recent
edition of the ITE Trip Generation Manual to estimate the internal capture reduction
percentage;
(B)
Rates higher than 15 percent require justification and may be approved on a case-
by-case basis with Planning Director approval;
(C)
Reductions for internal capture should be applied to multi-use or mixed-use sites
only;
(D)
Internal capture shall not be taken for AM peak hours or from lodging land uses;
(E)
Internal capture procedures shall not be used on a retail-only site; and