The Pennsylvania Turnpike Commission will have single-lane patterns and two-way traffic in the southbound Lehigh Tunnel from 8 a.m. to 2 p.m. July 18-21 for tunnel maintenance, including updating overhead lighting.

Each day between 7:30 a.m. and 8 a.m., turnpike maintenance crews will implement a traffic stoppage of no more than 15 minutes in both directions to set a crossover pattern directing all traffic into the southbound tunnel.By 8 a.m. the northbound tunnel will be closed and all traffic diverted into the southbound tunnel until 2 p.m. when the patterns are lifted.The Lehigh Tunnel is located at milepost A70-A71 between Lehigh Valley, Exit 56, and Mahoning Valley, Exit 74, in Carbon County.