Compared to a top human sprinter (near 28 mph), what speed range do estimates often place larger terror birds within?

Answer

The upper tier of terrestrial speed, rivaling ostriches

Estimates for the larger terror birds often place them in the upper tier of terrestrial speed, comparable to the 43 mph sustained by ostriches.

Compared to a top human sprinter (near 28 mph), what speed range do estimates often place larger terror birds within?
birdextinctspeedrunterror bird