Andy said it best--
50mph in a 30 is 20 over--no matter what you're riding.
On the other hand I had a 50+ mph 70cc scooter and I'd take it on the highway-- never stopped & I passed the polica barracks every morning.
55 is slow on the highway but it was fast enough to make the minimum speed and was a very big bike-- larger than a 200cc vespa.
I've personally ONLY been pulled over for doing something stupid and even then being polite has got me out of all but one situation.
This is just speculation-- but if I were a cop I'd pay a lot more attention to the moped riding 25mph like a bicycle on the right than I would notice a TTLX go by at 40, keeping up with traffic.
My dad was really well known locally and the cops (and tons of people who seem to know me and I don't know them...) say hi and totally give me a lot of room. I've even got rolling toward a redlight when I see the side yellow change so I can be at a decent 15mph when the light changes.. .I think that's called "charging a red light" but it's not much of a charge on a moped.
And proving the 70cc kit in court... the DA or judge hears moped and pretty much looks for a way to drop it. At least in maine if you're bagged for a 70 kit (very unlikely) and tell 'em you want it before a jury...
they've got drunks, assaults, criminal speeding.. prostitutes...and the DA is gonna call in the cop and put the moped case up there? nope. Even better if you have pictures with a scale showing the old 50cc engine.
I got stopped on the scoot going 30 in a school zone... deserved that but did escape w/a warning.
I think they don't take you as seriously... an SUV going 80 takes precedence over a moped struggling to hiit the 45 speed limit.
This is Maine. We need inspection insurance registration and a valid drivers license-- but, for example, I know for a fact that a 6-speed derbi enduro is classed as a "moped" in the local city hall.