This project is an extension of Interstate H-3 across the Koolau mountain range on the island of Oahu, near the city of Honolulu. The tunnel project consists of two tunnels, two lanes each, with shoulders, and as a "curved wall" horseshoe shaped configuration. The tunnels are approximately 5,000 feet long and contain the latest state-of-the-art technology in ventilation, lighting, traffic control and monitoring and emergency life support systems. This extension of H-3 was opened to traffic on December 12, 1997. This Project was awarded the 1998 Outstanding Civil Engineering Achievement Award by the American Society of Civil Engineers (ASCE). The tunnels are named the Tetsuo Harano Tunnels in recognition of the former DOT's Highways Chief's 52 years of dedicated service.

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