The Pennsylvania Turnpike Commission says drivers should expect an extended detour while a portion of I-476 is closed. The closure will run from tonight at 9 o'clock until Monday morning at 4 in Lehigh and Carbon counties. The Turnpike is being closed in both directions from the Lehigh Valley Interchange to the Pocono Interchange. The northbound lanes will be diverted at Lehigh Valley and southbound traffic will be diverted at Pocono.