In Austria the MTW is classified as a 3wheel motor bike. Here wearing a helmet is mandatory for bikes...
Other countries, other regulations: I'm interested if MTW owners drive with helmets or just use goggles and maybe other headgear. What's your best experience?
Hannes once: Green M3W; 2013 now: Red 4/4 Sport; 2011 and some practical cars for use in real life