The Virginia Department Of Transportation Reminds Motorists To Anticipate Day And Nighttime Lane Closures On Northbound Interstate 81 At Mile Marker 18 Now Through Thursday. The 24-Hour A Day Multi-Day Work Period For Northbound Repairs Is Necessary To Allow Crews To Replace The Concrete Bridge Deck By Up To Five Inches In Depth And Allow For The Concrete To Properly Mold. Motorist Should Avoid The Area When Possible.