In 1990, the first four fixed routes were started between Kapaʻa and Līhuʻe, and was expanded island-wide in 1992 with Hurricane Iniki recovery funding from the Federal Emergency Management Agency.

[2]: 4–1 The Kauaʻi Bus has a central administration, operations, and maintenance facility at 3220 Hoolako Street in Līhuʻe.

[2]: 9–20 The Kauaʻi Bus operates six fixed routes; five of those run seven days a week.

Three of the routes make up the Mainline service, which runs along the perimeter of the island from Kekaha to Hanalei.

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