The following month, a drone’s motor shut off as it switched from an upward flight path to flying straight ahead. Two safety features — one that’s supposed to land the drone in this type of situation and another that stabilizes the drone — both failed. As a result, the drone flipped upside down and dropped from 160 feet in the air, leading to a brush fire that stretched across 25 acres. It was later put out by the local fire department.
An autonomous tricycle would have to do obstacle avoidance. The advantage of flying drones is that there's less stuff in the air.
True!