Most of the time I do not wear a helmet in Austria and most of the cops do not know (or do not care) how to classify the M3W. So far they were rather interested on the age, technical specs and the price. Besides of that: a Helmet is mandatory and a motorcycle license is required too.
Hannes once: Green M3W; 2013 now: Red 4/4 Sport; 2011 and some practical cars for use in real life