I remember in Driver's Ed class learning the "official" bike turn signals: arm outstretched straight = left turn; arm in an "L" position (right angle at the elbow, fingers pointing to the sky) = right turn. BUT TRUST ME, most automobile drivers (and many bicyclists for that matter) are not going to remember what an "L" arm signal means! Clearly, some government official decided that the signal for right turn had to be different than left turn without considering the realities of the road.
