From the PA Turnpike Website: (
http://www.paturnpike.com/rttc/AdvisoryInfo.aspx?ID=121614)
Title: Planned Detour Interstate 76 Carlisle to Breezewood
Location: 226-Carlisle AND 161-Breezewood Mileposts: 226.5-161.5
Direction:
All Lanes Affected:
All Lanes Traffic Flow:
At or Near Posted Speed Limits ETA:
3/15/2009 @ 4:00 AM
Report Type: Update Date/Time: 3/12/2009 6:45 PM
Comments:
Please be advised of a planned detour this weekend on the Pennsylvania Turnpike, between the Carlisle Exit 226 and Breezewood Exit 161 interchanges. The detour is scheduled Saturday night March 14th into Sunday March 15th, and will begin at 11:00 pm for Eastbound motorists by closing the Breezewood Interchange Exit 161. Westbound motorists will be detoured at 11:45 pm when crews close traffic at Carlisle Interchange Exit 226. Blue Mountain Exit 201, Willow Hill Exit 189 and Fort Littleton Exit 180 traffic intending to travel Westbound will be permitted to enter the system. The detours are required so that crews can demolish two overhead bridges located in Cumberland County.
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Now that's some detour!
The most logical alternate route to me seems to be US 30 between Breezewood and Chambersburg and I-81 between Chamberburg and Carlisle.