I use hand signals regularly when I drive my UXV540i on the street, I have a "special commercial" registration, a discretionary on the registrar if she thinks you qualify, (limited to agricultural and commercial, I got it as a land surveyor) only equipment needed is a mirror, and tractor triangle, don't even need a windshield
I know the signals, but I'm not sure the drivers I'm signaling do, 90% of the time, they don't use their own signals