Drones can access their prime speed in seconds and might make hairpin turns, all while flying near to the ground and maneuvering by tight spaces. Your perception of speed is significantly amplified in these instances and reaction time dwindles to microseconds. There are, in complete, 5 different groups of drones. https://blockchain-news04724.ivasdesign.com/50224302/drones-with-collision-avoidance-for-dummies