(Citation omitted.) Gonzalez v. Ga. Dept. of Transp., 329 Ga. App. 224, 225, 764 S.E.2d 462 (2014) ; Sadler v. Dept. of Transp. of the State of Ga., 311 Ga. App. 601, 603, 716 S.E.2d 639 (2011). "[I]f [GDOT] is entitled to immunity under ... OCGA § 50–21–24 (10), then the trial court lacks subject matter jurisdiction to try the negligence claims, and the suit must be dismissed."

(Citations and punctuation omitted.) Gonzalez v. Ga. Dept. of Transp ., 329 Ga. App. 224, 225, 764 S.E.2d 462 (2014). Here, the Thompsons’ expert, Herman Hill, testified that Cleveland Highway originally was planned in 1922 as a two-lane road, and redesigned in 1973 to add three passing lane locations, one of which was located near Jess Helton Road heading northbound out of Gainesville toward Dahlonega.

We must, therefore, vacate the judgment and remand for proceedings consistent with this opinion. See Derbyshire , 194 Ga.App. at 843(1), 392 S.E.2d 37 ; see also Gonzalez v. Georgia Dept. of Transp. , 329 Ga.App. 224, 225–226, 764 S.E.2d 462 (2014) ; Glass v. Gates , 311 Ga.App. 563, 573–574, 716 S.E.2d 611 2011. “If the court finds no jurisdiction as to [Harrod], the final judgment rendered against [him] must fall.” Derbyshire , 194 Ga.App. at 843(1), 392 S.E.2d 37. If not, the trial court may reinstate the judgment.