Interstate 10 (I-10) is the southernmost transcontinental highway in the United States Interstate Highway System. Spanning 2,460.34 miles (3,959.53 km), it ranks as the fourth-longest Interstate highway in the country, after I-90, I-80, and I-40. Part of the original 1956 Interstate Highway network plan, its final segment was finished in 1990.
In 1956, Interstate 10 was part of the originally planned Interstate Highway network laid out in the United States.
In 1957, the highway existed.
In 1976, a sign near the western terminus of I-10 in Santa Monica proclaimed the highway to be the Christopher Columbus Transcontinental Highway.
In 1990, the final section of Interstate 10, specifically a portion of the Papago Freeway including the Deck Park Tunnel in Phoenix, was completed.
In 1990, the last section of Interstate 10 was completed, marking a significant milestone in the highway's development.
In 1999, the Texas Legislature raised the speed limit along I-10 from Kerr County to El Paso County to 75 mph.
In 2006, the speed limit along I-10 from Kerr County to El Paso County was raised to 80 mph by the Texas Legislature.
In 2007, the widening of Interstate 10 from four to six lanes began from the I-8 interchange in Casa Grande to Marana, Arizona.
In 2008, a proposal surfaced to make the new highway connecting Dothan, Alabama, with I-10 a toll road and expedite its construction.
In 2008, a three-mile stretch of Interstate 10 in Pensacola, Florida, was widened to six lanes as part of ongoing improvement projects.
In June 2009, construction was completed on a project to widen an eight-mile stretch of Interstate 10 to six lanes (eight in some places) in Tallahassee, Florida.
In 2009, the widening of Interstate 10 from four to six lanes was completed from the I-8 interchange in Casa Grande to Marana, Arizona.
On September 1, 2011, nighttime speed limits were eliminated, and the statutory maximum speed limit in Texas was increased from 75 to 80 mph.
In 2012, federal funds previously set aside for the highway connector between Dothan, Alabama, and I-10 were allocated to other projects.
In 2022, after years of lobbying by Native Americans, the state legislature authorized the removal of the Christopher Columbus Transcontinental Highway sign near the western terminus of I-10.
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