many years ago i had a BMW R75/5 that i bought from Gus khun motorcycles in London and that was brilliant as the indicator circuit was connected to the spedo, and after a short distance they canceled, you only had a a push button on each side of the handle bar once pressed it started the link to the spedo and then canceled, a very simple but effective system, why this can't be done now i don't know especially with the modern electronic spedo's that smiths now make , would make a very good safety feature.