The North Texas Tollway Authority (NTTA) has agreed to develop and operate the Southwest Parkway/Chisholm Trail toll project in Tarrant and Johnson counties in the US state of Texas.

The $1.6bn, 28-mile toll project is the authority’s first tollway in the counties and is expected to improve mobility in North Texas.

The Southwest Parkway/Chisholm Trail is also a critical transportation link for the west side of the Dallas/Fort Worth Metroplex.

Construction is underway on the northern section of the roadway while environmental clearance for the Chisholm Trail portion of the roadway has yet to be issued.

The entire project is expected to be complete and open to traffic in 2013.