The Virginia Department of Transportation (VDOT) announced on January 18, 2008, that it and the Virginia Department of Rail and Public Transportation (DRPT) had begun work on a draft environmental impact statement (EIS) for the I-66 corridor in Fairfax and Prince William counties. According to VDOT the EIS, officially named the I-66 Multimodal Transportation and Environment Study, would focus on improving mobility along I-66 from the Capital Beltway (I-495) interchange in Fairfax County to the interchange with U.S. Route 15 in Prince William County. The EIS also allegedly includes a four-station extension of the Orange Line past Vienna. The extension would continue to run in the I-66 median and would have stations at Chain Bridge Road, Fair Oaks, Stringfellow Road and Centreville near Virginia Route 28 and U.S. Route 29. In its final report published June 8, 2012, the study and analysis revealed that an "extension would have a minimal impact on Metrorail ridership and volumes on study area roadways inside the Beltway and would therefore not relieve congestion in the study corridor."