No motor vehicle shall be operated in a small boat harbor in a careless or negligent manner or in disregard of the rights and safety of others, or without due caution or circumspection, or at a speed or in a manner which endangers or is likely to endanger person or property, or while the operator thereof is under the influence of an intoxicant as defined under chapter 291E, Hawai'i Revised Statutes, or if the vehicle is so constructed, equipped, loaded, or in a condition which would endanger or be likely to endanger other persons or other person's property.
Haw. Code R. § 13-233-3