Salt Lake City earns its No. 2 spot in large part because of its heavy investment in serving a large suburban and exurban population. It is the No. 1 city in the nation in terms of public transit spending per capita, one reason being the current expansion of the Utah Transit Authority’s light rail system, known as TRAX. The city is adding four new lines to the three-line system, allowing better suburban access to the city; though the city’s population is just over 180,000, the system serves 1.7 million people in the larger area. Those residents take great advantage of the system; despite ranking No. 43 in terms of population, the city was No. 18 in terms of passenger miles traveled in 2008.