I am aware that personal auto insurance will cover a rental car. That's why I decline the waiver when I rent.
However, insurance companies do not always cover accidents that occur when you in violation of a contract, which may be considered negligent or reckless behavior.
Credit card companies are one popular form of rental car coverage, but they have this clause stating they will not pay if you were driving in violation of the contract.
This case with Amex illustrates what can happen:
http://www.concierge.com/cntraveler/traveltips/10617
I know someone whose family was stuck with buying their rental car Jeep after an accident on dirt road down near Kalapana. The driver had a twenty year relationship with his insurer and had a lawyer on retainer. In spite of best effort using an attorney, his car insurance refused to pay because he was driving on an unpaved road, which is an exclusion in the rental car contract.
They eventually repaired and sold the Jeep, and recovered all but $8000 of the costs, but all the repairs were done by talented family, not a shop.
Some personal auto insurance may pay, some may not. A person needs to check to be sure. "Loss of use" charges are not covered, and they can be costly. Also you have to pay your collision deductible, and a lot of people have $500 deductibles.
For those Punaweb readers who visit and rent cars, or have family visit, here's a useful page from Hawaii Discount Car Rentals. They work with all the agencies. It explains which agencies allow which roads when it comes to Saddle Road and MK Access Road. Only Harpers allows the summit road.
http://www.hawaiicarrentals.net/car-rent...-road.html
There are five agencies that now allow the Saddle Road, but Budget and Avis exclude the road to the VIS on grounds that it's a dangerous road.
I didn't mean to cause a whole side topic by mentioning the insurance problems that visitors who self-drive may run into, but since it was questioned ... this is what I know on it -- enough to make me do some homework before I would plan to take some Alamo Jeep up to the summit. YMMV [
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"Sometimes it's not enough to know what things mean, sometimes you have to know what things don't mean." — Bob Dylan