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Commissioners debate numeric thresholds, look to ITE and SCDOT guidance
Summary
The group discussed whether the county should keep the historic 90‑unit threshold for requiring a TIS or adopt percentage/weighted approaches and updated ranges from the ITE Trip Generation Manual and SCDOT guidance.
Commissioners asked whether the 90‑unit trigger still makes sense; staff and presenters cited the ITE Trip Generation Manual, SCDOT/ARMS materials and other counties’ approaches as sources to calibrate local thresholds. Several commissioners said the manuals provide ranges rather than single numbers and urged tailoring numbers for Greenville County’s suburban and rural contexts.
The presenters proposed a table of placeholder capacity and LOS values by road type to start conversations; several commissioners suggested lowering the midpoint values to catch up with growth rather than simply accepting older ranges that reflected very different statewide conditions years ago.
