The ones I saw at NAU were walking speed, and very paranoid/conservative about obstacles, so if you were to ride past one it would probably freak out. Hopefully in either a "stop and wait until it's all clear" or "move as quick as possible AWAY from the obstacle", which would honestly be better than most squirrels and rabbits I run into, whose instincts seem to be "ok I see something big coming, the right time to cross in front of it is, wait for it, wait for it, NOW"