A lawsuit against the State Highway 45 Southwest (SW) toll road is now heading to an appellate court.

Earlier this month, the Save our Springs Alliance (SOS), an Austin-based group that has fought the construction of SH 45 SW, filed an appeal to a 2016 ruling that dismissed its litigation and allowed the project to proceed.

SH 45 SW, a four-lane toll road that will bridge MoPac in Austin and FM 1626 near the Hays and Travis county lines, is currently under construction.

The new highway is a toll ro...