The state Department of Transportation and Development will roll out plans next week for a project to widen Interstate 10 between Lafayette and Breaux Bridge, the first major reconstruction for that stretch of interstate in at least three decades.

DOTD will show off the proposed road project at an open house event set from 4 p.m. to 7 p.m. Tuesday at the North Regional Library in Carencro.

The project, estimated to cost from $100 million to $125 million, is expected to begin in 2016 and involves reconstruction of the road and the addition of a third lane in each direction on I-10 between the Interstate 49 interchange in Lafayette and the Breaux Bridge exit, according to information from DOTD.

That 6.5-mile section of I-10 has been due for reconstruction, and the additional lane was seen as a necessity to keep traffic flowing during the two years or longer it will take to replace the pavement, DOTD spokeswoman Deidra Druilhet said.

She said adding the new lane will allow crews to work on one lane at a time and leave two lanes open for travel to avoid any major traffic headaches.

“There really should be minimal effects on the commute,” Druilhet said.

I-10 is the main east-west route across south Louisiana, and daily traffic counts there have risen from roughly 38,000 in 1997 to more than 70,000, according to figures from DOTD.

The widening project between Lafayette and Breaux Bridge is set to go out to bid in June 2016, and construction could begin in the fall of that year, Druilhet said.

A similar project to reconstruct and widen I-10 between Breaux Bridge and Henderson is set to go out to bid by 2018.

The open house will give residents an opportunity to view plans about the project, ask questions and give input.

The plans for I-10 come amid ongoing work to widen U.S. 90 to three lanes in sections south of Lafayette.