The Pennsylvania Turnpike Commission advises motorists traveling on the Northeastern Extension (I-476) to be prepared for daytime single-lane patterns and two-way traffic in the northbound Lehigh Tunnel on Wednesday, April 23, from 8 a.m. to 2 p.m. for tunnel maintenance.

The southbound tunnel will be closed and traffic diverted into the northbound tunnel.The Lehigh Tunnel is located at milepost A70-A71 between the Lehigh Valley (Exit 56) and Mahoning Valley (Exit 74) interchanges.Message boards will be activated to update motorists of any changes in the schedule caused by inclement weather or unforeseen traffic conditions.Motorists traveling on I-476 should stay alert when approaching and entering the tunnel. Drivers are urged to turn on headlights, slow down and keep an adequate distance from the vehicle ahead; remain in the lane and do not pass in the tunnel. Customers who experience car trouble and cannot safely exit the tunnel should stay in the car, put on the hazard lights and wait for assistance. Tunnel personnel will monitor closed-circuit cameras and send help for disabled vehicles.Travel advisories will be posted at

www.paturnpike.com and Highway Advisory Radio (1640 AM) will be activated to provide travel updates.Travelers can getTurnpike traffic alerts by calling 866-976-TRIP (8747) or visiting the live Travel Conditions Map online at

www.paturnpike.com/webmap. The Turnpike'ssmartphone app, TRIP Talk, streams audio advisories to iPhone and Droid users so they can keep their hands on the wheel and eyes on the road. To download the free app, visit

www.paturnpike.com/triptalk.