Honda's Prototype 2 (P2), developed in 1996, was the first autonomous robot capable of walking without falling and has been honored as an IEEE Milestone. (https://spectrum.ieee.org/honda-p2-robot-ieee-milestone)

The P2 stood nearly 183 cm tall and weighed 210 kg. It could control its posture to maintain balance and move multiple joints simultaneously. The dedication ceremony is scheduled for 28 April at the Honda Collection Hall at Mobility Resort Motegi in Japan, where the machine is on display. (https://spectrum.ieee.org/honda-p2-robot-ieee-milestone)

Honda researchers began work in 1986 on a domestic robot that could climb stairs, remove impediments, and perform household tasks. They built prototypes from E0, consisting of legs only, through E6 before creating P1 with arms and head, leading to P2. The team analyzed human movement to set joint specifications and installed DC motors with harmonic-drive gears. (https://spectrum.ieee.org/honda-p2-robot-ieee-milestone)

Six-axis sensors detected ground reaction forces and foot movements while a posture-stabilizing control system adjusted gait in real time. The IEEE Nagoya Section wrote that the milestone demonstrated the feasibility of humanlike locomotion in machines, setting a new standard in robotics. (https://spectrum.ieee.org/honda-p2-robot-ieee-milestone)