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The year 2006 was the golden anniversary, or the 50th birthday, of the Dwight D.
Eisenhower National System of Interstate and Defense Highways. This system, usually
referred to as The Interstate Highway System, is a system of freeways named after the U.S.
President who supported it. The system is the largest highway system in the world, consisting
of 46,876 miles (75,440 km) of freeways. The construction of the interstate highway system is
an important part of American history. It has played a major role in preserviing and maintaining
the American way of life.
The Interstate highway system has several major functions. One of its major functions
is to faciilliittatte the distribution of US goods. Because the interstate passes through many
downtown areas, it plays an important role in the diisttriibuttiion of almost all goods in the United
States. Nearly all products travel at least part of the way to their destination on the Interstate
System. Another major function of the Interstate system is to facilitate military troop
movement to and from airports, seaports, rail terminals and other military destinations. The
Interstate highways are connected to routes in the Strategic Highway Network, which is a
system of highways that are viittall to the U.S. Department of Defense.
Today, most of the Interstate system consists of newly constructed highways. The
longest section of the Interstate system runs from Boston, Massachusetts to Seattle,
Washington. It covers 3,020.54 miles. The shortest two-digit interstate is from Emery, North
Carolina to Greensboro, North Carolina. It covers only 12.27 miles. All state capitals except
five are served by the system. The five that are not directly served are Juneau, AK, Dover, DE,
Jefferson City, MO, Carson City, NV, and Pierre, SD. The Interstate Highway System serves
almost all major U.S. cities
Each Interstate highway is marked with a red, white, and blue shield with the word
"Interstate,"the name of the state, and the route number. Interstate highways are named with
one or two–digit numbers. North–south highways are desiignatted with odd numbers; east–west
highways are named with even numbers. The north–south Interstate highways begin in the
west with the lowest odd numbers; the east–west highways begin in the south with the lowest
even numbers. There are mile markers at each mile of the Interstate system, starting at the
westernmost or southernmost point on the highway. Every Interstate highway begins with the
number "0." Interchanges are numbered according to their location on the highway in relation
to mileage; an exit between milepost 7 and milepost 8 would be designated "Exit 7." This
system allows drivers to quickly estimate the distance to a desired exit, which is a road leading
off the highway. Despite the common acceptance of the numbering system on the Interstate
highways, some states have adopted different numbering systems. For example, a portion of
the Interstate 19 in Arizona is measured in kilometers instead of miles since the highway goes
south to Mexico.