Interstate Highway System

The Interstate Highway System Is A Network Of Controlled-Access Highways That Forms A Part Of The National Highway System Of The United States. The System Is Named For President Dwight D. Eisenhower, Who Championed It's Formation. Construction Was Authorized By The Federal Aid Highway Act Of 1956, And The Original Portion Was Completed 35 Years Later, Although Some Urban Routes Were Cancelled And Never Built. The Network Has Since Been Extended And, As Of 2013, It Had A Total Length Of 47,856 Miles, About One-Quarter Of All Vehicle Miles Driven In The Country Use The Interstate System. In 2006, The Cost Of The Construction Was Estimated At About $425 Billion.

System Information
Length: 47,856 Miles

Formed: June 29, 1956

Highway Names
Interstates: Interstate X

System Links
Interstate Highway System: Main Interstate Highways - Auxiliary Interstate Highways - Suffixed Interstate Highways - Business Interstate Highways - Future Interstate Highways

Note: Alaska, Hawaii And Puerto Rico Also Have Interstate Highways.