MD 4 sign)
Motorists Can Expect Single Lane Closures and a Flagging Operation
(October 12, 2022) – The Maryland Department of Transportation State Highway Administration (MDOT SHA) will conduct routine maintenance on the MD 4 (Governor Thomas Johnson) bridge in Calvert and St. Mary’s counties between 6 a.m. and 2 p.m. Sunday, October 16, weather permitting.
During work hours, crews will clean the gutter and drainage areas. One of the bridge’s two lanes will be closed and a flagging operation will be in place. Portable variable message signs will be placed along area state routes to make travelers aware of the closure.
Customers who have questions about this work may contact the MDOT SHA District 5 Office at 410-841-1000 or toll-free at 1-800-331-5603.
The Move Over Law in Maryland requires motorists to make a lane change or slow down when approaching any stopped, standing or parked vehicle displaying hazard warning lights, road flares or other caution signals. The expanded law is in place to protect emergency responders and motorists who encounter a roadside emergency.
Motorists in need may dial #77 on their mobile device for roadside assistance.
For a list of all major MDOT SHA projects, go to
Project Portal. Visit our homepage at
roads.maryland.gov. For a look at real-time traffic conditions, go to
From intersection improvements to widening and new interchange construction, MDOT SHA is investing in projects to enhance the commute and daily travel for millions of Marylanders. MDOT SHA maintains more than 2,500 bridges and 17,000 miles of non-toll state roads – the interstate, US and state numbered routes in Maryland’s 23 counties.