While it's difficult to measure their speed, most sources state upwards of 70 Km/h, and they're known to be the second fastest land animal, second only to the cheetah, but able to sustain higher speeds for longer distances than the cheetah.
I've given up hunting speed goats because they taste like a cross between a Slim Jim and sagebrush.
While passing, with a sigh of relief, we thank the highway gods that we are not the 'speedgoat'. But inevitably, that day and that siren comes for us all.
From the pig latin: scapegoat
"Better watch it, sunshine," replied white-knuckled Jane from the passenger seat. "The way you're driving, your time will come!"