The markings on the PD vehicle is Mountain Park. If in Georgia, there is Mountain City on US 441 just north of Clayton. There are no exit ramps of that nature up there.
Mountain Park, Ga. is between Roswell and Woodstock, off Hwy 92. There are no similar-appearing roads in that city, either. All surface streets. It couldn't have been within 20 minutes of being delivered to Dawsonville.
My guess as to what happened, judging by the 2 pictures that show either end of the exit ramp, is that he was either running too fast, or he suddenly decided to take the exit, again, speed being a factor.
Whatever the cause, it is disappointing for car people to see a classic such as this totally destroyed. Hope the buyer already had it insured and that the transporter has sufficient insurance, too.