Hwy. 144 in parts of Richmond Hiill will be closed from 8:30 a.m. Monday, May 21 to 3 p.m. Tuesday, May 22 to provide railroad grade crossing improvements, according to the Georgia Department of Transportation. The detour route will be Hwy. 17 to Harris Trail Road and then Timber Trail Road. Detour signs will be posted. Drivers should allow extra time for travel.