For decades, traffic congestion in the southern Utah city of St. George was limited to St. George Boulevard, which would swell with traffic during the spring and summer as tourists and retirees crowded into the area to enjoy its temperate climate and nearby national parks.
From 2000 to 2005, St. George was the fastest-growing metropolitan region in the U.S., according to census data, and traffic congestion was becoming a regular occurrence. During the height of the population boom in this city about 100 miles northeast of Las Vegas, traffic engineers began looking for a solution.