The Pennsylvania Turnpike Commission advises motorists traveling on the Northeastern Extension (I-476), north of Lehigh Valley (Exit 56) and south from Mahoning Valley (Exit 74) to be prepared for a traffic stoppage of no more than 15-minutes between 11 p.m. Jan. 17 and 2 a.m. Jan. 18 for work inside the northbound and southbound tunnels.Scheduled to occur in both directions after 11 p.m., traffic approaching the tunnel will be stopped to allow workers to safely perform maintenance on the closed-circuit cameras. Motorists should be prepared for slow moving or stopped traffic approaching the Lehigh Tunnel. To avoid delays motorists are advised to seek an alternate route.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 you are following; remain in your lane and do not pass in the tunnel. If you experience car trouble and cannot safely exit the tunnel, stay in your car, put on your hazard lights and wait for assistance. Tunnel personnel will 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 get Turnpike traffic alerts by calling 866-976-TRIP (8747) or visiting the live Travel Conditions Map online at www.paturnpike.com/webmap. The Turnpike’s smartphone app, TRIP Talk, streams audio advisories about traffic conditions 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.