Runway 16R/34L, the primary runway at Van Nuys Airport in southern California, is closed until July 26 at 11:59 p.m. The closure is part of a $20.5 million improvement program, which includes asphalt milling and paving of more than 4,000 feet of the center section of the runway. Runway 16L/34R (4,000 feet long) remains open as normal (closing at night from 10:45 p.m. to 6 a.m.). Pilots are urged to check notams before flying to Van Nuys. The runway improvement project will be completed in August.