Motorists who use Highway 9 in the Santa Cruz mountains should prepare for overnight road closures in the Ben Lomond area do to road maintenance operations. The closures are from 8 p-m until 5 a-m every night this week until Friday. Parts of Highway 9 will be closed in both directions. Detours will be in place in the area of Lower Glen Arbor Road and various other roadways. Motorists should expect delays of up to 20 minutes.