U.S. Census Bureau Daily Feature for June 29 -- WASHINGTON, June 29, 2013 /PRNewswire-USNewswire/ -- WASHINGTON, June 29, 2013 /PRNewswire-USNewswire/ -- Following is the daily "Profile America" feature from the U.S. Census Bureau: Profile America - Saturday, June 29th. On this date in 1956, President Dwight Eisenhower signed a bill establishing the Interstate Highway System, originally of 41,000 miles. Today, that system is America's main street - linking all 48 continental states along it's nearly 47,000 miles, and making it the largest highway system in the world. The original cost of the interstate system was more than $25 billion. From rural dirt roads to the interstate highways, there are 4 million miles of roads in the U.S. Building new roads and bridges involves almost 11,000 businesses in work worth more than $105 billion a year. Sources: www.fhwa.dot.gov/interstate/faq.htm 2007 Economic Census, NAICS 237310