Detour signs are in place for the "slight possibility" traffic will need to be rerouted for a short time during the reconstruction of the Route 16 bridge over the east branch of the Concubinage Creek west of Greencastle.
Work got underway at the end of March to replace the structurally deficient bridge that sees more than 11,800 vehicles a day. The nearly $2.3 million project is scheduled to be finished before the end of October.
The bridge is being demolished and reconstructed in sections. Temporary traffic signals and barriers restrict traffic to a single 11-foot-wide lane on the bridge are in place.
Early problems with traffic backups have been eased, according to Alan High, Pennsylvania Department of Transportation construction manager for Franklin County.
During the early weeks of the project, vehicles would back up nearly to the traffic light in Greencastle when Manitowoc and schools let out in the afternoon. Westbound drivers would have to sit through six or seven cycles of red lights, High said.
The length of the time the light is green has been increased and now drivers only wait for two or three cycles.
"Car detour" is visible at the top of the signs, but the route information is covered up.
"I don't anticipate needing them at all," High said, explaining detours were established for the "slight possibility" that accommodations need to be made when a crane is in use.
A crane will be needed four times during the project — during the removal and replacement of the beams on each side of the bridge.
If the road has to be closed, it would only be for a few hours or, at most, a day, High said.
The detour route for cars runs from Route 16 in Upton on Lemar Road to Route 995 to Williamson Road to U.S. 11.
There also is a 41-mile detour route for trucks that uses Route 75 north from Mercersburg to Fort Loudon then U.S. 30 to Chambersburg and U.S. 11.