The circulation patterns in Juneau stems from the major interstate highway that is one of the only means of access to the city. From this highway smaller roads stem, but rarely stray far from the major road. The highway runs along the inlet shore allowing it to be used for the transportation or good and supplies for the harbor, one of the main sources of income for Juneau. The other major means of access to the city is through the shipping lines. These are used both for recreational tourism and industry, making them vital to the city’s success.