"Much-needed improvements" will begin Tuesday on Route 33's interchange with Route 512 in Northampton County, announced spokesmen for the state Department of Transportation.
The $13.1-million project will take two years to complete.
Delays are expected and motorists are encouraged to use caution and allow extra time when traveling through the work zone.
The project includes milling and repaving about one mile of Route 33, installing a new median barrier on that section of the highway and rehabilitating its bridges over Route 512 and Male Road.
Ramps at the interchange will be lengthened and rehabilitated, Route 512 will be patched and paved between Epps Street and Male Road and a traffic signal will be installed at 512 and Jacobsburg Road.
Other "miscellaneous construction" will be done as part of the project, according to PennDOT.
During the first phase of construction, lane restrictions will be on Route 33 from 6 p.m. to 6 a.m. weeknights, for paving shoulders and median areas. That work will begin on the southbound side of the highway, then move to the northbound side. It is expected to be completed by July.
Then traffic will be shifted, utilizing median or shoulder areas to allow two lanes of Route 33 to remain open in both directions. No long-term lane restrictions are scheduled, but motorists may experience short-term restrictions.
Throughout the project, lane restrictions will be on Route 512 between Male Road and Epps Street, but one lane of traffic will be maintained in both directions at all times.
The project will be in the borough of Wind Gap and Plainfield Township. PennDOT reports that section of Route 33 has an average daily traffic volume of 33,175 vehicles. The average daily traffic volume on Route 512 ranges from 8,882 vehicles at the western end of the project to 18,961 at the eastern end.
The $13,117,000 million project is expected to be complete in May 2015. General contractor is James D. Morrissey, Inc. of Philadelphia.
Updates will be provided whenever traffic patterns change. Motorists can log on or call 511 from any phone to check traffic conditions before traveling.