In a road construction update the Grassy Sound Bridge, which connects Stone Harbor and North Wildwood, will be closed to vehicle traffic from 10 p.m. Thursday to 6 a.m. Friday for scheduled bridge maintenance, Cape May County officials said.There will be a detour in place on both sides of Ocean Drive directing traffic to the 96th Street bridge in Stone Harbor. Boat traffic will not be affected, the county said in a news release.