Hoʻohana nui ʻia nā guardrails no nā wahi ʻōmaʻomaʻo o ke kūlanakauhale, nā moena pua o ka māla, nā wahi ʻōmaʻomaʻo, nā alanui, nā mokulele, a me nā pā ākea o nā awa. He nani nā hiʻohiʻona a me nā waihoʻoluʻu like ʻole nā huahana guardrail uea ʻelua ʻaoʻao. ʻAʻole wale lākou e pāʻani i ka pā, akā hoʻokani pū kekahi i kahi hana nani. ʻO ka pale uea ʻaoʻao ʻelua he ʻano hana maʻalahi, nani a kūpono hoʻi; maʻalahi ka lawe ʻana, a ʻaʻole i kaupalena ʻia kona hoʻokomo ʻana e nā loli ʻāina; hiki ke hoʻololi i nā mauna, nā pali, a me nā ʻāpana he nui; ʻO ke kumu kūʻai o kēia ʻano pale uea bilateral he haʻahaʻa haʻahaʻa, a he kūpono ia no ka hoʻohana ʻia ma ke ʻano nui.