Under Construction: Route 3 Passing Lanes between Potomac Mills and Flat Iron


Cost and schedule ►

Public outreach ►

This $12.7 million project will build eastbound and westbound passing lanes over a 1.5-mile segment of Route 3 between Potomac Mills and Flat Iron in Westmoreland.

When work is complete, Route 3 will become a four-lane undivided road from north of Route 639 (Winter Harbor Road) to east of Route 624 (Longwood Road). Route 3 will have four 12-foot travel lanes, and a 4-foot paved shoulder on each side.

Left turn lanes are being added on Route 3 eastbound at the intersection with Longwood Road, and on Route 3 westbound at Winter Harbor Road and Route 761 (Falls Hill Road).

Building additional travel lanes along this two-lane section of Route 3 will provide traffic with an opportunity to pass slower-moving vehicles.

A separate $1 million project to lengthen the right turn lane on Route 3 eastbound to Route 624 (Flat Iron Road) will be accomplished as part of this construction work zone and contract.


  • Provides travelers with an opportunity to pass slower-moving vehicles, reducing congestion on Route 3

Major Milestones 

Construction begins: January 2021

Construction complete: Late December 2021


Major funding source: SMART SCALE

Phase: Under construction

Lat/Long: 38.161909, -76.939942

Locality: Westmoreland

Page last modified: Dec. 29, 2020