Ariz. Rev. Stat. § 28-815 – Riding on roadway and bicycle path; bicycle path usage

A. A person riding a bicycle on a roadway at less than the normal speed of traffic at the time and place and under the conditions then existing shall ride as close as practicable to the right-hand curb or edge of the roadway, except under any of the following situations:
1. 1. If overtaking and passing another bicycle or vehicle proceeding in the same direction.
2. 2. If preparing for a left turn at an intersection or into a private road or driveway.
3. 3. If reasonably necessary to avoid conditions, including fixed or moving objects, parked or moving vehicles, bicycles, pedestrians, animals or surface hazards.
4. 4. If the lane in which the person is operating the bicycle is too narrow for a bicycle and a vehicle to travel safely side by side within the lane.
B. Persons riding bicycles on a roadway shall not ride more than two abreast except on paths or parts of roadways set aside for the exclusive use of bicycles.
C. A path or lane that is designated as a bicycle path or lane by state or local authorities is for the exclusive use of bicycles even though other uses are permitted pursuant to subsection D of this section or are otherwise allowed by state or local authorities.
D. A person shall not operate, stop, park or leave standing a vehicle, including a neighborhood occupantless electric vehicle, in a path or lane designated as a bicycle path or lane by a state or local authority except in the case of emergency or for crossing the path or lane to gain access to a public or private road or driveway.
E. Subsection D of this section does not prohibit the use of the path or lane by the appropriate local authority.