MD 450 (Defense Highway) between The Ridges Gateway and Crownsville Road/South Haven Road – Culvert replacement project – MD 450 to be closed and detoured beginning at 11:45 p.m. Friday, August 16 until 5 a.m. Monday, August 19. Motorists will be directed to US 50 and MD 424 (Davidsonville Road) as detour routes. This is expected to be the last weekend full closure and detour.