Here is the Motor Vehicle Code section that states what a moped needs for equipment:
Motorized Bicycle: Safety and Equipment Requirements
24015. (a) Motorized bicycles shall comply with those federal motor vehicle safety standards established under the National Traffic and Motor Vehicle Safety Act of 1966 (15 U.S.C., Sec. 1381, et seq.) which are applicable to a motor-driven cycle, as that term is defined in such federal standards. Such standards include, but are not limited to, provisions requiring a headlamp, taillamp, stoplamp, side and rear reflex reflectors, and adequate brakes.
(b) In addition to equipment required in subdivision (a), all motorized bicycles operated upon a highway shall be equipped with a mirror as required in subdivision (a) of Section 26709, a horn as required in Section 27000, and an adequate muffler as required in subdivision (a) of Section 27150.
(c) Except as provided in subdivisions (a) and (b), none of the provisions of this chapter relating to motorcycles and motor-driven cycles, as defined in this code, shall apply to a motorized bicycle.
Amended Ch. 421, Stats. 1978. Effective January 1, 1979.
No signals required