GUILDERLAND — Cars leaving the Guilderland Public Library can now turn left onto Mercy Care Lane and wind around to the traffic light at the intersection of Route 20 and Winding Brook Drive.

The section of Mercy Care Lane that starts beyond St. Peter’s Addiction Recovery Center, or SPARC, and runs to Winding Brook Drive — which had been closed to traffic — has been conveyed to the town.

The highway department opened the road on Aug. 29 after it finished making needed improvements.

Highway Department Superintendent Gregory Wier said Wednesday that the department installed signs, including one speed-limit sign on each side of the section of road, a stop sign where Mercy Care Lane intersects with Winding Brook Drive, and chevrons on Mercy Care Lane to indicate a spot where the road curves.

Wier said that the portion of the road that runs from SPARC to Route 20 is owned and maintained by St. Peter’s Health Partners, who will be making some improvements to that section of the road.

Once those improvements are complete, he said, the town will negotiate with St. Peter’s Health Partners to take over the remainder of the road, to Route 20.

“Once that happens,” Wier said, “the entire road will become a town road.”

Town Planner Kenneth Kovalchik said that the town, meanwhile, is doing its “due diligence” with regard to the section still privately owned, to make sure that there is clear title to the land and that there are no drainage issues.