Motor pacing to train has been around as long as motorcycles. Whizzers, mopeds, or motorcycles depending on the speeds needed. Often used for some kind of world record attempt, where the rider needs to pull a huge gear on the track, but needs to train on the road for it to keep costs down. Helps get started in the draft, makes pulling that huge gear easier in training getting the body used to a cadence that can break the record. Then the day of the attempt, the rider knows by feel how to ride the right speed.