代步

to get around using a conveyance (car, bicycle, sedan chair etc) / to ride (or drive) / means of transportation

to substitute / to act on behalf of others / to replace / generation / dynasty / age / period / (historical) era / (geological) eon

surname Bu

a step / a pace / walk / march / stages in a process / situation

vehicle / (more specifically) mobility vehicle (mobility scooter, electric wheelchair, Segway etc)