The island of O'ahu has a ridge of volcanic mountains that run roughly north and south along the east coast. There are three main highways that cross the mountains and in each case, there is a major tunnel cutting through the ridge. The ridge creates its own weather. Every time we crossed the ridge it was raining on the mountain and dry on both sides. The west side of the ridge is much drier than the eastern side. Most of the population and the larger cities, including Honolulu, are on the western side. Of course, the whole island chain has a volcanic origin and the steep, highly eroded mountains are evidence of creation of the island. 80% of the population of Hawai'i live on O'ahu and I think they are all on the roads driving all the time. The island has some of the worse traffic congestion outside of New York City and Philadelphia.
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