Chapter 2: Speed Limits

Controlling your speed is one of the most critical responsibilities a driver has. Understanding and obeying speed laws is not just about avoiding a ticket; it is about managing the physics of your vehicle, allowing for adequate reaction time, and protecting yourself, your passengers, and others on the road. The knowledge test will require you to know specific speed limits, and safe driving demands that you apply the “Basic Speed Law” in every situation.

The Basic Speed Law

Hawaii’s most fundamental speed regulation is the Basic Speed Law. This law requires that a driver must never operate a vehicle at a speed greater than is reasonable and prudent under the existing conditions, regardless of the posted speed limit. The posted maximum speed limit is intended for ideal conditions, including clear weather, good visibility, light traffic, and a dry road surface.

Factors that require a driver to reduce speed below the posted limit include:

• Heavy traffic or congestion.
• The presence of pedestrians or bicyclists, especially near crosswalks and intersections.
• Poor weather conditions such as heavy rain, which can cause hydroplaning.
• Reduced visibility due to fog, rain, or darkness.
• Sharp curves, hills, or narrow roads.
• Road hazards like gravel, construction zones, or debris.

For example, on a highway with a 55 mph speed limit, driving at 55 mph during a torrential downpour would be a violation of the Basic Speed Law because it is not a safe speed for those conditions.