FORT WORTH -- One of the biggest highway construction projects in North Texas has finally hit the halfway point.

Drivers know all-too-well the traffic-plagued stretch of I-35W north of Fort Worth that has been the site of non-stop construction for years. It's a $1.6 billion project to expand a 10-mile stretch of highway, adding express toll lanes and new pavement to an artery that serves over 100,000 drivers every day.

The project is on track to be complete by 2018. The section from I-30 to I-820 is now 50 percent complete.

Further north, the stretch from I-820 to North Tarrant Parkway is 75 percent done and should be finished this year.

This week, there have been significant changes for drivers with new southbound lanes from 28th Street to Pharr Street, and a new off-ramp for SH 121.

"It's getting a little better, but it is crazy," said Frank Abalos, who was filling up his car near the highway today. "I try to stay off it as much as I can."

For now, the only constants are change and traffic. Officials say one culprit for the traffic is confusion among drivers, who are trying to figure out lane changes and may gawk at traffic.

They encourage motorists to check the North Tarrant Express Facebook page and Twitter account for the latest information, so they can be prepared before hitting the road.