When we last looked at rider training, it was the Jawa dual control motorcycle from 1959. Shown here is the Nelson trainer, designed by Bernard G. Nelson of Maine in 1968. Instead of dual controls out on the street, this is simply a set of rollers that the trainee rode until the instructor deemed him or her safe enough to venture out on a real motorcycle on an actual road.
I get the feeling they were trying too hard to come up with a technical solution to a problem no one was trying to solve. Was it really that hard to just ride around a parking lot first?