Wake Forest Unified Development Ordinance - July 2022

Subdivision & Infrastructure Standards 6.11 Transportation Impact Analysis


Discuss any conflict with other driveways or streets, queuing problems, potential safety problems. K. Pedestrian Facilities: Indicate location of existing and proposed sidewalks and crosswalks, internal pedestrian paths. L. Recommended Improvements: Indicate improvements required for access points and signalized intersections within study area to operate at acceptable level of service (D or better). These may include site access, internal site circulation, signalization, signal modification (retiming, additional phases), lane modifications or additions, or street widening. A signal warrant study is not required but may be included as supporting documentation where a traffic signal is requested. Note: showing recommended improvements does not necessarily indicate responsibility for improvement. Report may indicate which improvements are due to development and which are due to existing problems or other growth in traffic and may suggest responsibility of developer or of other parties for improvements. Proposed improvements should be shown schematically on figure. M. Engineer’s Seal: All TIAs are to be prepared and sealed by an engineer registered in the State of North Carolina and specializing in traffic or transportation, with experience in preparing TIAs. 6.11.3. Enhanced TIA Requirements An enhanced TIA includes all of the elements of a standard TIA plus the following: A. Study Area: Generally from 1 to 3 miles from each proposed site access along roads accessed by the site. The extent of the study area should be discussed with town staff prior to initiating the TIA. B. Internal Circulation: Review internal circulation patterns and note recommended changes. C. Trip Distribution: Use of a computer model for distribution may be desirable for major projects. D. Future Conditions: Projects in this category, other than perhaps shopping centers, are likely to be phased. It is desirable to show conditions at end of planning period (generally 20-year or horizon used for thoroughfare plan). E. Recommended Improvements: For major projects, these may involve changes to the thoroughfare plan or collector street plan. The project may include the construction of portions of thoroughfares within or adjacent to the site.

6.11.4. Improvements May Be Required

Based on the findings of the analysis, if a proposed development does not meet the applicable service level standards, the applicant shall be required to upgrade the facilities in accordance with the adopted level of service program. Mitigation measures may involve strategies other than roadway construction or other physical improvements such as changes to traffic signal timing or phasing, and transportation management strategies.

6.11.5. Thresholds For Mitigation

The town requires consideration of roadway and/or operational improvements when the proposed development increases the intersection Volume-to-Capacity Ratio (V/C) beyond the thresholds indicated in the table at right. The town evaluates the impacts of proposed development at intersections (primarily under existing year conditions) based on the increase in V/C ratio as a result of the projected site traffic. Existing V/C Allowable Increase in V/C By Development 0.00 – 0.60 0.10 0.61 – 0.70 0.07 0.71 – 0.80 0.05 0.81 – 0.90 0.03 0.91 – 1.00+ 0.02

Town of Wake Forest Unified Development Ordinance – July 19, 2022


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