The Pennsylvania Turnpike Commission advises motorists to be prepared for nighttime single-lane patterns and two-way traffic in the Lehigh Tunnel on the Northeastern Extension (I-476) from 8 p.m. to 6 a.m. Sept. 11 through 15.

Crews are inspecting the tunnel and doing water line maintenance. The tunnel runs between the Lehigh Valley interchange at exit 56 and Mahoning Valley at exit 74.

Stoppages will be no more than 15 minutes in both directions. They are used for setting up a crossover pattern directing all traffic into the northbound tunnel, prior to the start of work each day.