Motorists should be on the lookout for a shift in traffic in a construction zone just in West Montgomery County.

Demolition has started on the old U.S. 166 railroad overpass west of U.S. 75. Traffic is being re-routed through the work zone on the new overpass that is being constructed just south of the old structure. The eastbound U.S. 166 ramp to southbound U.S. 75 has also been closed for reconstruction.

Construction began on the interchange in July of last year and is expected to be open to unrestricted traffic late this summer, weather permitting. The cost of the construction is $3.4 million.