The stand, which lines either side of the road for more than a mile, providing shade and a characteristic smell.

[3][4] Before the construction of the Kaumualiʻi Highway (Route 50), the tree tunnel was three times longer than its current size.

[3] As Road 520 enters Kōloa, on the west side is the remains of the original Kōloa sugar mill, commemorated by a plaque and sculpture,[5] erected in 1985 to commemorate the 150th anniversary of commercial sugar production in Hawaii.

Route 520 then continues as Lāwaʻi Road briefly, before it splits to the west leads to Spouting Horn and the National Tropical Botanical Gardens.

The final stretch of the highway is marked as Hoʻonani Road, and terminates at Kōloa Landing.