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In page Interstate H-3:

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One anecdote relates to the elevated section passing through Haʻikū Valley. In this valley, the viaduct passed beneath the antenna of a US Coast Guard radio transmission facility. It was thought that the energy field from the antenna could interfere with heart pacemakers—a potential detriment to drivers and passengers on the roadway. A giant metal cage was designed to surround the roadway through the valley. Before H-3 was opened, the US Coast Guard closed their transmitting facility, obviating the need for the cage. Although the full cage was never built, buried within the roadway was the bottom of the cage. HDOT decided to not construct this steel mesh prior to opening of the freeway.[citation needed]