Drove Morgan 3 Wheelers (1928 Aero, then 2013 M3W) in NY state from 1998 until this fall without a helmet, stopped by state trooper in October who said MC license plate, must wear helmet. I've learned to pick my battles, so now wear a DOT half helmet and goggles. Safer, I guess, not as much fun, but not too restrictive. Drove once on public roads with a full face Bell helmet, I felt my vision was too restricted knowing the kinds of drivers on the road today!