After months of being a single-lane road officiated by stoplights, a stretch of Monticello Road a few miles north of an intersection with Wooden Valley Road is back to two lanes -- but only at night.

Caltrans workers have recently repaired a half-mile section of a lane that had been largely washed away by fierce New Year's Eve storms, but workers still need time to make repairs on the guardrail, drainage areas and overlay paving. Until those repairs are complete, Caltrans officials say one lane of the road will be closed by flaggers while workers do their jobs.

The good news is also the bad news: It could take weeks for the state to line up subcontractors to perform the repairs. While workers are unavailable, motorists will be treated to an unfettered two-lane road, but with guardrail issues.

"If (the guardrail subcontractor) has some work in the area he'll hop right on it," said Steve Cobb, Caltrans spokesman. "If he doesn't have work in the area. He'll have to schedule it in at some time."

The road has been a source of frustration to Napa County residents who use Monticello Road to commute to jobs in Napa or attempt to make a quick trip to the supermarket.

When portable stoplights refereed north and south traffic along the one-lane roadway, some motorists felt the state used technology that was too old to tell when one direction needed more green light time than another. The problem compounded on weekends when tourists headed to and from Lake Berryessa clogged up the queue at the north and south stoplights.