Jesse, The link you cited is just general information and does not go far enough to reflect the actual motor vehicle code. You are right however about turn signals, those are only required on low speed vehicles.
Here is the exact citation in the motor vehicle code...
"257.312a Motorcycle endorsement; issuance, suspension, revocation, cancellation, or renewal; special restricted license to operate moped; requirements; duration; expiration; fees.
Sec. 312a.
(1)
(2) A person, before operating a moped upon a highway shall procure a special restricted license to operate a moped unless the person has a valid operator's or chauffeur's license. A special restricted license to operate a moped may be issued to a person 15 years of age or older if the person satisfies the secretary of state that he is competent to operate a moped with safety. The secretary of state shall not require a road test before issuance of a special restricted license to operate a moped."
The motor vehicle code specifies what safety equipment is required for motor vehicles which include cars, motorcycles, low speed vehicles, mopeds etc.
Headlight requirement....
"257.685 Head lamps; number; modulator; height; auxiliary, spot, or other lamp; exemption.
Sec. 685.
(1)
(2) A motorcycle or moped shall be equipped with at least 1 and not more than 2 head lamps that comply with this chapter."
Brake light requirement...
"257.697b Rear stop lamps.
Sec. 697b.
A person shall not sell or offer for sale or operate on the highways a vehicle manufactured or assembled after January 1, 1965, except those exempted from certificate of title requirements under the provisions of section 216, unless the vehicle is equipped with 2 rear stop lamps except on a motorcycle or moped meeting the requirements of section 697. A motorcycle or moped shall be required to have 1 rear stop lamp."
Horn...
"57.706 Horn or other warning device; siren, whistle, air horn, or bell; theft alarm signal device.
Sec. 706.
(a) A motor vehicle, including a motorcycle or moped, when operated upon a highway shall be equipped with a horn in good working order and capable of emitting sound audible under normal conditions from a distance of not less than 200 feet but a horn or other warning device shall not emit an unreasonably loud or harsh sound or a whistle..."
IMO, if motorized bikes become more popular, the police will either crack down on them as being mopeds, or the legislature will clarify what motor assisted bicycle is. Hopefully they will go with the federal guidelines and not the moped law.