The Kahekili Highway is narrow, twisty, and very slow (speed limits usually 15 mph or slower), with many one-lane stretches, and often with minimal reflectorization and guardrails. Driving at night, or in poor visibility, is not recommended for drivers unfamiliar with the road. Some rental car companies may prohibit driving their vehicles on this road. Also, the last ten miles of the Honoapiilani Highway (state route 30), west from the Kahekili Highway toward Kaanapali, are narrow and winding (though not quite as slow as county route 340).

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