PLANNING AND ZONING COMMISSION AGENDA ITEM
ACTION REQUESTED:
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Receive the report on the traffic impact study process within Naperville
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DEPARTMENT: Transportation, Engineering and Development
SUBMITTED BY: Andrew Hynes, PE, PTOE, City Engineer/Deputy Director
ENTITLEMENTS REQUESTED:
N/A
BOARD/COMMISSION REVIEW:
N/A
BACKGROUND:
A Traffic Impact Study (TIS) is a site-specific study conducted to determine the impact of the traffic generated by a proposed development on the surrounding roadway network. The study analyzes the roadway network for the pre- and post-development scenarios to determine how the development impacts the operations of the roadway network. Traffic Impact Studies typically contain the following elements:
* Existing traffic data (collection of peak hour traffic volumes and movements)
* Trips Generation - from the proposed developed (typically developed using the Institute for Transportation Engineers Trip Generation Report or case studies of similar developments)
* Trip Distribution - Assigning the direction distribution of existing and entering new trips
* Capacity Analysis - Evaluating the before and after traffic conditions using established traffic engineering principles and software tools.
* Conclusion and Recommendations - If the projected traffic impacts are significant, site-specific mitigation measures such as new turn lanes or traffic signal timing adjustments are recommended.
A TIS evaluates the site-specific impact that a development has on the Level of Service (LOS) of an intersection or a roadway. The LOS is a grade from A to F where Level A indicates free flowing conditions without delay, and Level F indicates high levels of congestion, and most motorists do not get through an intersection in one traffic signal cycle. The City desires a LOS D or better for an intersection during the peak travel hours except for downtown Naperville where a LOS E is considered adequate.
DISCUSSION:
When evaluating the need for a...
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