这个应该不是由chase提供的，是master card提供的
每种卡都有一些细节的条款说明某些情况下是不cover的，总体来说几种卡里面
mastercard是最不好的。有别的卡尽量用别的卡
看这篇文章 http://www.cardhub.com/edu/rental-car-insurance-credit-card-stu
VISA and MasterCard are the only two networks that do not cover accidents
occurring on dirt and gravel roads. As if that weren’t enough, MasterCard
also has a confusing stipulation that excludes accidents occurring on roads
that aren’t regularly maintained.
