This document summarizes the status of improvement projects along the I-66 corridor from US Route 15 to I-495 in Fairfax County, Virginia. It discusses the tiered NEPA process being used to study improvements, with Tier 1 examining broad concepts and Tier 2 analyzing specific details of selected concepts. The Tier 1 process identified 10 alternative concepts and concluded that no single concept could satisfy all needs. A Request for Information received responses supporting public-private partnerships and managed lanes as solutions. Next steps include identifying Tier 2 projects and initiating associated studies.