The answer lies in their antennae, which they position so that their tips stay very close to the ground. Unlike many nocturnal animals, which wave their feelers around for wide-field search, tiger beetles keep them rigidly in front. Their flexible tips reliably make contact with pebbles, sticks, and other surface features, and enable the beetle to adjust its body angle before "face planting". This makes it possible to detect and negotiate obstacles at high speed without even seeing them.
This study can be found in Proceedings of the Royal Society B: Biological Sciences, 281 (1779).