This page does NOT constitute Legal advice. This page is simply here to help show you what some of the Arizona Revised Statutes say about Motorized Bicycles and the operation of them. I give you a brief description or overview of what I think the statute says, but there is a link to the actual statute and it is up to you to read and interpret the statute! Only an idiot would take legal advice from somebody who is not a lawyer, don't be an idiot! Read the laws yourself and form your own opinion.

You can find a complete list of the ARS here:

Arizona Revised Statutes Title 28 Transportation

For the purposes of this page any time it says "motorized bicycle", the proper term is "motorized electric or gas powered bicycle or tricycle."

ARS 28-2516

States that Drivers License is NOT required for a motorized bicycle.
States that a Certificate of Title is NOT required for a motorized bicycle.
States that Registration is NOT required for a motorized bicycle.
States that Insurance (Chapter 9) is NOT required for a motorized bicycle.
States that Vehicle License Tax is NOT imposed on a motorized bicycle.
States that motorized bicycle is Exempt from Required equipment for motorcycles. (Sec. 28-964)
States that motorized bicycle is Exempt from Vehicle emissions inspections (Title 49, chapter 3, article 5)
States that motorized bicycle may use bike lanes (rights-of-way designated exclusively for bicycles)
States that Local Authorities can NOT require registration and licensing of motorized bicycles.
States that this chapter does NOT prohibit local authorities from passing an ordinance to regulate or prohibit operating motorized bicycles.
Defines motorized bicycle as: bicycle/tricycle that is equipped with a helper motor that is 48cc or less, may also be self propelled, and is operated at speeds of less than 20MPH.

ARS 28-964

States that operator of motor driven cycle under 18 shall wear a helmet.
States that operator of motor driven cycle shall wear protective glasses at all times. (unless you have a wind shield.)
States that motor driven cycle shall be equipped with a rear view mirror.
States that motor driven cycle shall have a seat, footrests, and handrails for any passenger.
States that handlebars cant be above your shoulders when sitting astride the seat.

ARS 28-812

States that a person riding a bicycle on a roadway or on a shoulder adjoining a roadway is granted all of the rights and is SUBJECT to all the DUTIES applicable to the driver of a vehicle by this chapter and chapter 4 (DUI) and Chapter 5 (vehicle violations) of this title, except special rules in this article and except provisions of this chapter and chapter 4(DUI) and chapter 5 (vehicle violations) of this title that by their nature have no application.

ARS 28-817

States that a bicycle used at nighttime shall have a white light visible 500 ft away and a red reflector on the rear that can be seen from 50 ft away in any direction and 300 feet from the rear.
States that a person shall not operate a bicycle that is equipped with a siren or whistle.
States that a bicycle shall be equipped with a brake that enables rider to skid.

ARS 28-705

States that a person shall not operate a motor driven cycle at any time provided in sec. 28-922 (when it's dark) at a speed of more then 35 MPH unless it is equipped with headlamp that are adequate to see person at 300 feet.

ARS 28-944

States more stuff about headlights. You should be able to see a person at 100 feet or 200 feet. (Again, just my opinion, but if a cop is measuring how far your headlight works if you have one, then you were probably doing something really stupid and were an idiot to the officer to make him/her give you a ticket for this! Just my opinion.)

ARS 28-815

States that person riding bicycle should stay to the right as close to curb as possible.
States that person riding bicycle should not ride more than 2 side by side.

ARS 28-811

States that parent or guardian shall not permit child to break these laws/regulations.
States that this chapter applies to bicycles operated on highway or on a path set aside for the exclusive use of bicycles.

These were just a few of the Statutes that caught my eye. If I don't have one listed above, it doesn't mean that it's not important or you won't get a ticket for it. You should read all the Statutes to determine for yourself the regulations you need to follow.

I hope this helps make it easier to find the laws you are looking for.