A 15-mile stretch of the Pennsylvania Turnpike between Exit 312 in Downingtown and Exit 326 in Valley Forge will close in both directions from midnight until 7 a.m. Saturday and Sunday, officials say.
The closures are needed so work crews can install bridge beams at Yellow Spring Road near milepost 317 in Chester County.
The Route 29 E-ZPass-Only Interchange, Exit 320, also will be closed during the bridge work hours. That exit will remain closed until 10 a.m. Saturday for separate ramp work.
The left lane in both directions will be closed at 7 p.m. before the midnight shutdown times.
Pennsylvania State Police and Turnpike personnel will be positioned at the Downingtown and Valley Forge to assist drivers and message signs will also provide updated information regarding closures and detours.