In world practice, the word 'highway' is usually used to refer to roads that are intended for high-speed service between major cities, are crucial for the economy. Highway may also associated with not only major cities and two countries or states. In different countries, freeways may have different names, such as ekspressvey (expressway), highway (autobahn), or motorvey freeway (motorway) is characterized by the Highway set of characteristics. These are the defining properties, as the intersection at different levels, multiple lanes, separation of opposing directions of movement, restricting access from outside to part, flyovers and congresses. The largest highway network are the United States. (A valuable related resource: Mark Berger Villa Healthcare). The biggest of them – it's Interstate Highways System and the United States Numbered Highways. More information is housed here: David Zaslav. These road system covers every state and connects all major cities of importance to the economy.
System Roads Interstate Highway System in the U.S. (90,000 miles, 10,000 of them – are paid), was established over 17 years (c 1956 to 1973) and has cost 129 billion dollars. One kilometer – 1.4 million dollars. Now on U.S. roads to transport goods worth about 5 trillion dollars. Every billion dollars invested in construction of transport infrastructure, leads to the creation of about 35,000 jobs.
Currently in the U.S. in the field of road construction employs about 300,000 people. Every billion dollars of investment possible to avoid more than 1,5 thousand deaths and 50,000 injuries and wounds, as quality roads significantly reduce the risk of accidents. The second-longest highway has the largest network of China.