How would neglect of the highway forestall development on Oahu?
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Can't tell when that was taken, but you can see a downhill stretch and a car for scale. IIRC, there were tighter stretches on the uphill runs from Lanai
Just couldn't get heavy construction equipment up that road and scaring the tourists kept all but the affluent from making the effort. Part of the Thomas-Lindburgh, effort was keep the native population and culture intact. Colonialists, but well meaning. And it worked for some time.
Final note: on that afternoon we were the only vehicle on the road coming and going.