Transportation in Salt Lake City consists of a wide network of roads, an extensive bus system, a light rail system, and a commuter rail line. Although Salt Lake City, Utah, is a traditionally car-oriented city (as are most other cities in the western United States), the rapidly growing public transit system has a high number of riders for a city of its size, and public transit is widely supported by its residents and businesses. Nearly all public transit in the city is operated by the Utah Transit Authority. In addition to operating the bus system, it also operates the TRAX light rail system, which contains three lines, the first of which runs from downtown south to Draper, the second runs from University of Utah southwest to South Jordan, and the third from the Salt Lake City International Airport east through downtown and then southwest to West Valley City. A commuter rail line, called the FrontRunner, runs north through Davis County to Ogden in central Weber County and south to Provo in central Utah County. UTA also operates a streetcar line that connects the Sugar House neighborhood with the TRAX system in South Salt Lake. The road system is also extensive, with three interstate highways, two additional state freeways, a limited-access highway, and a third state freeway under development/construction. However, the geographic constrictions of the Salt Lake Valley, as well as its rapid population growth, have led to severe congestion problems. Roads Two major interstate highways, Interstate 15 and Interstate 80, intersect just west of downtown. I-15 comes in from the north end of the state, through Davis County, and heads straight south through the Salt Lake Valley and on through Utah County to leave the state on its southwest corner. I-80 comes in from the west side of the state, through Tooele County and passes the Salt Lake City International Airport before merging with I-15 west of downtown. The merge continues south for about before I-80 continues east. It passes through largely residential areas through northern South Salt Lake and the Sugar House neighborhood of Salt Lake City before ascending Parley's Canyon, passing through Summit County, and leaving the state on its northeast corner. Interstate 215, known as the "Belt Route", forms a 270° loop around Salt Lake City and its first-ring suburbs. It enters the Rose Park neighborhood in northwestern Salt Lake City from Davis County (where it recently