A 2006 study by VDOT estimated that AM slugs along the I-95 corridor numbered about 6,450, which was about twice the number estimated in 1999 for this corridor. The 2006 estimates were based on morning peak counts at 15 slug line pickup locations along the Virginia I‐95 corridor. This includes sluglines in Fairfax and Prince William counties in the VDOT Northern Virginia District as well as locations in Stafford County and Fredericksburg in the VDOT Fredericksburg District. Source Virginia.gov.