It starts on Monday. Dr. Gridlock has a nice breakdown. For bikes:
Bikers and walkers don't have it any better: The popular Mount Vernon Trail is narrow and unprotected as it crosses the bridge. Bikers are supposed to dismount before crossing, but they often disobey the signs, endangering themselves and others.
-- Add a barrier to separate the trail users from the traffic.
-- Lower the grade of the parkway across the bridge to improve sight distance. [WC: this should make for an easier ride too]
-- Eliminate a pedestrian crosswalk on the parkway and add a tunnel under the bridge for safer passage between the Columbia Island Marina, the Mount Vernon Trail and the Potomac shore.
-- The Mount Vernon Trail will remain open.
Please let me know if this (the trail staying open) is not the case.