LIDAR still has a signal to noise ratio that limits it though, especially with materials that reflect little with the wavelength used (usually NIR, somewhere ar

LIDAR still has a signal to noise ratio that limits it though, especially with materials that reflect little with the wavelength used (usually NIR, somewhere around 980nm, the military uses 1500 because it's more eye-safe). But even then, this impacts the maximal detection range only. Even if the obstacle suddenly popped up at 20m it should have been enough to drastically reduce the collision speed.